Do you regret any of your past relationships?

Biggest regret I ever hard was to dump a girl because her parents didn't like me. She was willing to ignore their hate towards me and even as far as moving in with me but I still didn't like the fact that if I ever wanted to get married with her I would have to live with the fact that her parents resented or hated me. I recently bumped into her in the streets and told me she has a family and two girls. Yet I am here still single and alone.. The guy she married also was resented by her parents but that didn't stop him. sigh