Is it normal to feel the heartbreak a year after?

I was in a 3 years long relationship during highschool and first year of college. We were the broke up - make up -constantly kind. I've always had a very difficult time getting along with people, since I'm anxious and was bullied during my whole childhood. I wanted to belong to his world, his friends, almost as if I wanted to be part of his school class, like one of the pack. However, he never stood for me if someone wasn't nice, and never gave any sacrifice back.. he gave me flowers and stuff but I wanted a boyfriend who could be a friend, someone to stand by me. He just didn't.
We broke up and now he dates one of his classmates... it felt so wrong because I tried so hard to belong, but it seems to be that for him, if you didn't already belong to his group of friends, or didn't get along perfect with them... you weren't good enough. I didn't cry myself to sleep when we broke up (It just happened, like we stopped seeing each other and that's it, no goodbye kiss or anything).
A year from that I'm in a wonderful relationship with the perfect man. He is amazing, takes care of me and loves me so much. But some songs or memories remind me that I stopped seeing someone from one day to another, and that I never cried it. I just took pills for anxiety, ignoring the fact that it was a heartbreak. And now I'm feeling it. It hurts and I don't know how to handle it. I don't have feelings for my ex at all. Maybe my heart is just starting to suffer over a pain I never gave myself the chance to suffer.

Help.