I don't know what to do about my boyfriend... Need some advice.?

I have been with my boyfriend for two years this Wednesday. We have had some great times together and there is no doubt he has been my first love. We have been through so much what with his dad dying 2 months into our relationship, our parents not wanting us to be together because there is a four year age gap (I’m now 16 and he is 20). He also had to be rushed into hospital when his appendix burst which changed us completely. We became so much more united. He has also helped me through depression which I am still trying to overcome, although he isn’t always supportive, especially when the doctors decided to put me on medication. I was sure when I first got with him that I would always want to be, and that I wouldn’t never want to be with anyone else for the rest of my life. I now am beginning to realize that I was so young and so easily influenced that I completely over looked all of his flaws. He has been terrible to me, cheating on me, getting friendly with his ex again and inviting her roundto our flat where a lot of things happened that are too complicated to explain. I did nothing to deserve any of it and they have destroyed me. He has recently started to become violent, only shoving me into walls and pinning me against the floor etc. but I can’t help but be scared by this as I grew up with domestic abuse because of my dad. I realize I’m making him sound terrible but I have been pretty damn horrible to him too. In many ways it is not a healthy relationship at all but at the same time we can be so in love and caring and considerate with each other that it is making my decision ten times harder. And despite everything I love him so much and I think I always will. I know he would like to settle down soon but I’m not so sure anymore. As much as I would love to move in with him, have a child with him I just, I’m in two minds about it. Even though we are both in work now we are still not financially ready for a baby, nor emotionally ready. On the one hand I am young, I want to enjoy myself, I don’t want to be tied down, but on the other hand I feel so ready to settle down, I would like nothing more but I suppose I’m thinking do I really want to settle down with him or is there some one better for me out there? I have talked this over with friends in a lot more detail but to be honest I don’t know what to do. I need some advice, personal experience, some help please…I'm sorry its so long...

Sex is the key to everything remember theres always abortion, and if ur not financially ready ever thought of becoming a pornstar or work in a brothel to earn fast and big $$$$$