Been there....honestly it sucks to hell.
The next day, my guy texted me and said there was a girl he liked for a while, and asked her out and she said yes, so we can't speak anymore. Then blocked me from every means of contact. It was absolutely horrible. But I was over it after a week of horrible crying etc. because I changed my mentality and thought I can't be giving someone so much emotion and time when they don't care. The way that I get over people is to get back in the game. It's been about 4 years since that night and since we spoke. He changed my mentality with sex, I was a girl who waited to get to fully know that person before going all the way, but then now, as I figured they can dump you just as easily on day 1 as they can during month 10 - so now I don't bother waiting anymore. Which is actually quite sad because I know that's not me.
It hurts every time I think of it as well.