Cannot seem to get over my ex..?

Dated this girl for 4 years, we were very serious and can honestly say i love her. I gave her a promise ring but then things went south. Life moved on, worked during the summer and moved away to college.. and some how we ended up at the same college, yeah fml. Joined a fraternity, and met tons of girls.. but always in the back of my mind.. i wanted ex. She wanted nothing to do with me till this thanksgiving holiday when we both went back home. Called me up and told me how much she missed me, and me being an ideot.. i fell for it. Not a day later she blows me off, not wanting anything from me. Now it feels like the breakup all over again. I just want the hurt to go away and enjoy my college life