I only like guys with girlfriends. There's a superficial security. I tell myself they won't like me in a romantic way because they are in a relationship. It's backfired on several occasions. I find I can be myself completely and feel comfortable around guys who have girlfriends (the same for guys I am not physically attracted to). I have long been the victim of good male friends thinking they have feelings for me. It happens to my sister as well. We call it a curse. Sometimes I think we're both just denying ourselves the right to be in a comfortable relationship. But when the guy has a girlfriend: First I am surprised that they act on their feelings for someone else. Then I am disapoinnted in their integrity and strength. Somewhere in there I am flattered and wonder at the possibility of sucess. But that never happens.
I have on more than one occasions been left doubting the integrity of relationships. No relationship is secure, humans are bound to make mistakes, we're bound to act on desire or instinct and as a result we're bound to hurt others and ourselves.