I've learned from everything I've done and only regretted the things I didn't have the courage to do.
not do it and regret... that one can really suck.
not to do and regrat
Both are equally awful. I lost a whole set of friends over an affair, and the sex was mediocre at best. I passed up on another affair, and ended up in a dead-end relationship. You just have to take a chance and see where things go.