I married her.

I met this girl in grade school. She bullied me relentlessly for years. Of course a boy being bullied by a girl back in grade school inspired more bullying by other kids. Then in the 7th grade she left our school and I was relieved for her to be gone. Then when I entered high school a few years later I bumped into her again in one of my classes. She didn't seem to remember me but I remembered her. Funny thing was, she had become a very friendly person by this point. I had no idea what inspired this change in her but it would make me chuckle sometimes. We were never really friends in high school but we shared a few classes. Had a few friendly conversations.

Then I went to college and again didn't see her for a few years.

A few years after college I returned to my hometown and ran into her again (obviously). We really hit it off this time around. We fell in love and we are now married and have children together. My having a bully was the best thing that ever happened to me. I even look back on our grade school years fondly now.