It's been a couple of months... Help

So my boyfriend of two years broke up with me, this kid was my first with everything and we're going to the same college so I sometimes I see him. I get this terrible feeling when I do see him it feel like my inside are being squished and it sometimes makes me really sick. I'm really lost, I try talking to other guys but it just doesn't feel right. The few time I have seen him he pretends to not see me or notice me. Our breakup was really bad.  I pray that he finds his path and that I find mine but I find it hard to let go of all the memories and when I do think of them they make me super sad it's been a couple of months but it still bums me out. Any advice?