Why does this happen?

First off I would like to just say that I might be over reacting. I really hope I am because this is upsetting me really really bad. I started talking to this guy I have always liked. He really seemed interested, he kept saying how beautiful I was and was just flirting like crazy. Now he won’t open my Snapchat and I don’t know if he’s ignoring me or if he’s just actually busy.

I really just want this one relationship to actually happen. I always end up with a broken heart and I’m really getting tired of it. I really like this boy. I haven’t felt this way about a guy ever. I get so nervous, and with every other guy I have talked to I’ve been calm. He told me I was beautiful, and that the world needed more girls like me. I’m so scared. What do I do? What if I’m not good enough?