Suddenly we don't talk anymore....what happened?

So I met this guy in June, & every single day after that we would talk. We got to know each other. He told me he was happy I was his, & that he was made for me. He was the sweetest thing. & he was unlike any other guy I've met. Well...we haven't talked in almost 3 weeks. The last thing he texted me was 'hi baby, what's up', I replied, & that was it, he didn't say anything back. It's not like we ended on a bad note. We just all of the sudden stopped talking. I tried texting him back a few days later, but it wouldn't go through. I later found out that he got a new number, & I don't have it. I don't know what to do. This is one guy that I really can't let go. The other day one of my friends told me that he was talking about me and how much he liked me. I find that odd since we haven't talked in so long. I have no idea what to do. Any advice?
Suddenly we don't talk anymore....what happened?
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