Should i break up with him?

This guy and me have been together for about 2 years now. I really love him and i would do anything for him, i feel like he controls me. when we first started dating we were do close we always hung out and always talked and spent almost everyday after school together. and now we calmed down and started hanging out with our friends more and doing other stuff, it seems like whenever we do hangout we end up having sex, its not that i don't enjoy it.. but its almost all we like to do anymore. i still find the stuff we do fun but he never wants to do it anymore, he always wants to go with his friends..one time I went to my friends quince(15th birthday) and there was dancing and it was so much fun! and he called me and got all mad at me because i went and didn't invite him, but when i asked him he said he didn't want to go? then the next month, he decided to smoke weed right in front of me when he knew i didn't like that. and he admitted to doing it before that with his friends too. it seems like he always does something stupid that i don't like and then i get mad at him and then it seems like i give in because all i want is to be happy. That's all i want! i really feel like breaking up with him but i don't know how to and i feel like ill have thoughts about suicide after i do it if I'm alone. The thought that scares me the most is that i will see him with another girl, or on face book talking to another girl. Every guy i've ever been with has hurt me. i want to be done with guys right now, but then again i don't know how to tell him. oh btw, hes cheated on me by telling a girl he had feelings for her around christasmas