This guy I really like constantly changes his mind with me, what do I do?

I met this amazingly sweet guy online (he's from England, I from Massachusetts) last week. I immediately fell in love with his kindness and personality and he seemed to like me very much in return. Unlike any guy before, he hasn't asked me for nudes or anything and he says he doesn't want that kinda stuff from me. We send each other really sweet messages and tell each other that we love one another. However, I'm not sure if I'm the only girl he talks to.. he does treat me so nicely and I want to believe that I'm the only one, but how could such a perfect guy not be discovered already. Also, after we send each other hundreds of cute messages he just seems to cut me off and leave me on open. Sure, I mean it's not a big deal one time, but it happens all the time after we send the messages to each other. He has told me about his thoughts and feelings on life and how he is suicidal and feels as if he is worthless. Of course, he's not. I love him so much as he is and he makes me happy. He dropped out of high school and now goes to college classes at fifteen (I'm fourteen). I don't know, should I trust him and really commit to us having a relationship? I mean, I have never felt this way about any guy and I really think I love him. I could see him this summer when I visit England, but otherwise we would have a long-distance relationship. He's been hinting at it too, I guess. Should I commit myself to him? I want to, but I don't know what he'll say. Help.