Confusion

I honestly don't know what to do.
My ex boyfriend wants us to get back together, and I don't know what to do. I'm still really, really messed up over him. He was my first serious boyfriend, and we were together for 4 months. May to August. I miss him.
But there's this guy here in Texas..his name is Nick..He's exactly what I like..He's exactly what I look for in a guy..I like him.
I just don't know what to do.