Please help me Please?

I am 18 years old and my name is Angela and I am with a 24 year old guy and he is constantly kissing on me and telling me that he loves me and he gets mad when i talk to my guy friends. When i am texting or on the computer he is watching over my shoulder. He says that he trusts me but when i don't call him he accuses me of cheating. I just don't know what to do anymore? I have been thinking about getting with my ex boyfriend Tony i have known him for 5 years and he is 16 years old. Me and him fell in love and was going to get married but then i was stupid and ended up cheating on him and now we are just friends and i still love him enough to marry him and he said that he still likes me more than a friend and he still loves me a little bit and that was chance that we could get back together and i promised him i was done with the cheating. What should i do?