Guys, do you ever regret not approaching a girl?

I used to see this guy I didn't know around my University constantly. Everytime we passed, we would make deep, intense eye contact. It pretty much became a normal, "mutual" thing, I almost felt like it was a "hello" by the end of it. The problem was that I am extremely shy and I think he may have been the same, so neither of us ever approached each other. I no longer see him and I regret not approaching him so much. I often wonder if he feels the same. Have you ever regretting not approaching a girl/guy?
Guys, do you ever regret not approaching a girl?
Post Opinion