How can I stop getting fatter?

I understand how you feel because i too weighed a lot and since being with my boyfriend of 5 year have gained more. He is very thin and doesnt eat all to healthy and tends to get me things when he eats too. I tell him consistantly not to but he still does. The thing i found best for me was to download an app on my phone that counts calories. It isn't fool proof but it will definitely make u more aware of what your consuming. You just plug in what you eat and it shows you how much calories is in it. the one i use is called MyPlate, you can put in your weight and your goal and it will tell you how much you should consume in a day. I mean its best to be healthy but one step at a time, first you might have to come into realization of just how overboard you're going. Remember, take it slowly, the faster you lose, the more chances you will end up reverting back to old habits.