What do I do when my relationship is going to shit, but deeply love the girl?

RUN, and don't look back. seems like you are both to young to be in a relationship.

trust is the most important part of a relationship, and there is no trust between the two of you.

DO NOT STAY TOGETHER!

Ditch her. She deceives you. She spies on you. She takes advantage of you. She makes you feel bad. There is no reason to keep her. She's just dragging you down. Put your love aside. She's using it against you. She will continue to manipulate you until you either leave her, or end up doing something stupid that you'll regret for a long time. Meaning jail time. Sure, breaking up with her will be tough on you, but you'll get over it. Imagine this. She ends up manipulating you into doing something stupid, and you get sent to jail. You'll regret that longer than breaking up with her.

Leave her behind. Continue on. You may find someone you love more than her.

This isn't love, it is excitement. It is easy to mistake the two. You love her for the same reason that good girls go for bad boys - it is exciting and you don't know what will happen next. It is like watching a suspense movie. You get a rush of chemicals in your brain and some of them feel good and you think it is love. But she is a jerk!!!! She treats you like shit!!!!! So seriously, bro. Walk away. Rule Number 1 of the very first relationship: IT WILL NOT LAST. The first relationship always ends and there is a simple reason why: Your first relationship is the one in which you make all the mistakes and the other person makes all their mistakes and it is stressful and crazy. You learn a lot from it, but you need to know when to end it. You seem to think that because it was your first one that means you should hold on. FALSE. You should date someone else who doesn't treat you like shit and lie to you all the time. Find someone who respects you. Also: You are a senior so you are what, 17 years old? 18? You said that 2 years ago you were immature as if now you are totally mature. Here is some science for you:
A female's brain doesn't fully mature until age 23. A male's brain doesn't fully mature until age 26! You have a couple years to go, and it isn't an insult or a bad thing. You are still growing. Next year you will be very different from who you are today. Two years from now you will be different from who you will be next year. The two of you will keep changing and becoming more different, and the odds of you growing together is very unlikely especially since she obviously doesn't respect you or care about your feelings.

Also, you are right: every guy watches porn. Want to know something else? Most women watch porn, and the ones who don't usually don't because they have been told all their lives that they are disgusting if they do. That's pretty shitty. That's also why a lot of women aren't honest about watching porn. It is also why women think men who watch porn are disgusting. What is my point? You are currently a victim of a sexist mentality. Sexism against women and their sexual freedom has indirectly affected you because it caused your girlfriend to think that sexuality is wrong and gross and that you are wrong and gross for having sexual needs. So, if you are smart, when asked about your opinion or how you feel about the subject you will encourage the women close to you to be whoever they are sexually and not to judge them. The more free women are to be sexual creatures, the more free men are to be accepted by women as sexual creatures.

My bf and i have been dating for 1.5 yrs. He is older than me (because I am smart and I wanted a mature guy!). We both watch porn separately (some couples like to do it together but we have different porn preferences so we just don't like to watch it together). He encourages me to watch porn if I want to and to please myself because he knows that it is my body and I should enjoy it. I encourage him to watch porn and to please himself because I know that it is his body and he should enjoy it. Both of us know that porn is simply fantasy and neither of us tries to bring our porn fantasies into our bedroom when we are with each other. You know what else? We have fantastic, exciting, healthy sex. We talk about sex, listen to each other about sex, and help each other with our needs. We do not judge each other. We are not jealous of the porn, and we are not worried about fidelity. YOU NEED TO BE MATURE LIKE THIS AND FIND SOMEONE MATURE LIKE THIS.

So, get rid of her. She WANTS to be mad at you. She WANTS you to do something wrong so she can be mad. Ugh - what a gross person!

try to explain to her that you really love and that you re able to be with her for ever but if she doesnt stop doing that kind of things tell her that things won t be the same ! i m pretty sure that she will understand if she didnt honestly ,, dude you should break up cause that s the right thing! i know it s hard but try to !

just avoid her bro
decrease contacting her, if she loves u, she comes for u!

You can't stay with s.o who treats you this way . I have been through this , i gave too much chances to s.o that doesn't deserve it . i kept giving chances for 3 years and 2 months it's too much i partially regret it i would have never given a second chance to s.o who constantly lies to me . It is difficult at first but then you'll totally forget her .
sometimes holding on does more damage than letting go .
But never forget i don't know you so my answer may not suit the situation .

mate i'm sorry about this but brake it of there are plenty of fish in the sea! ( sorry i'm not good with all that) i would say your find someone better and be happy but i can't you could its 50 50 but you may not everyone falls in love but shes probably not right for you lying why would she do that if she loved you? i know you love her and its hard but you have to maybe then she will realize what shes done and for gods sake if she cries don't feel bad and just leave! peace

One needs to remember that we change a lot from our younger years. Your wants and needs change. So yes you may love her, but I don't think it will last. You need trust in a relationship, a relationship should be fun, and not stressful. It should be someone you love and trust, your partner in crime. One is more scared sometimes of change than what you are scared of actually losing the person. Make a list of pros and cons - trust me it works....but you need to be completely honest with yourself....if the cons list is longer - you know what to do. It is never easy, but rather now than you both hurting each other more and missing out on really finding the love of your life.