Should I feel doubt in my heart?

I am not allow to see my boyfriend over stupid reasons but if I do see him and she knows if I am still with him. I will get kicked out of my house. My bf is 17 going on 18 in october and is currently a junior in high school. I am 18 going on 19 and a freshman in college. Unable to see him hurts since its been a long time and I heard a lot of things about him but he tells me another thing. I believe him since I barely know these people. But now he can get away with anything and I would never know. Today is the first time his status says bed had a great day :) I miss you already. He never did that when he saw me and he never went to bed that early. He always had trouble sleeping so seeing that hurts. He claims he loves me and etc. I know it is way too early but it makes things hard. I am unsure what to do and I am starting to rethink on this relationship wondering if it is really worth it.
the worst part is that if i do break it off for real he says he will kill himself then not seeing me. He knows I can not stand being the reason to hurting someone on purpose or not. I am way too kind hearted for my own good. I am scared as to what is going to happen if I do break it off for real.