I've had this happen with me, the way that I've "over came" it was to just shut out anything that was linked to them. I defriended them on Facebook, delete pictures I had of them (for me it was drawings), and then I talked about it with my closest friends. I told them what I felt, how I felt, How they made me feel and I got it ALL out. When I started doing that I started to move on, I'm it took a LONG time but I found someone else who I created that connection to. That connection still didn't work but I clawed my way to facing the whole thing head on and figuring out why I was still so attached to them when I could never have them.