Was he the first person you slept with? That can have quite an effect. I know how you feel, because after my ex broke my heart, and after I found out a whole lot of shady, disgusting stuff he got up to afterward, I got 'over' him pretty quickly. But when I was googling him out of curiosity several years later, I found him on a modeling agency website and when I looked up the pictures, a whole rush of feelings came flooding back. They didn't last long - I thought about him for maybe a day or two. But yeah. It was hard to see those pictures. They brought back a whole bunch of memories.