Boys suck

I've been in a funk for about a week over a boy. And I feel so pathetic about it, I never let this kind of thing happen to me.
He turned out to be a different person to what he was making me believe. I thought he was a genuine, nice and lovely guy who cared for me.  Turns out he manipulated me into getting what he wanted. Since he got it, I haven't heard squat from him. 
I've been moaping around ever since and I hate how much he got to me. But I can't get him out of my head!
I think I am mostly upset he's not the person I thought he was, and I wish he would be.