Should I stay or should I go?

Currently I'm in a relationship and things have gotten very bad. For the last few months, we have had nothing but heated arguments over several major issues. He thinks I'm cheating or thinking of cheating because the amount of affection I use to show him has decreased. I told him never say that to me or you can kiss the relationship good bye because that is not how I roll. He has trust issues because of his part girlfriends or girls he used to mess with and what ever they did, he is holding above my head. Now we weren't always at each other's throats like we are now. We used to be very kind and loving towards each other. We used to spend a lot of time together and things were really good. So good, we discussed marriage and kids a couple of times even though we are both still young (23 years old). But things started to change, and for the worse, when he lost his job last October. I tried to be a good girlfriend and stick through the hard times and convince myself that it would all be better. I didn't want to break up with him because he had done so much for me and that would mean that I was ungrateful for what he had done. But I also realized that I wasn't staying in the relationship for me but rather for him and something told me things weren't going to change. We would argue endless until I am submissive to exactly what he wants and I cannot do that for any one but myself. I told him I wanted a break because I didn't know another way to make this thing work. I needed time away from him, the arguments and negative energy that was coming from him for a little while so I could figure things out. I let him know this and he doesn't want that. He wants to try and work everything out the way it is and gave an option. Either I stayed with him or we broke up. I told him I didn't want to break up with him, I just needed some time to myself to get things figured out. He can't understand that and therefore wants it his way. He still wants to be with me but I told him I need sometime to myself and he won't give it to me. So I don't know what to do. Can someone tell me what to do or what is the best way to get this figured out once and for all?