Is it fair that my bf leaves me home alone with no car to go to his friends house for hours?

It's pretty dame selfish in my eyes, are there any children at home while he's gone, Also you should care what he does while he's away, he could bring something home to you that you don't want nor need, there's a need for respect for you on his part, ( IJS )

He is using you like a door mat - he does what he wants and when he pleases without consideration for you. This is only going to get worse not better. So, the next question you need to ask yourself is why are you staying?