How to deal with girls with boyfriends (please answer)?

[joshn62]

I keep having the problem with asking girls out only to find out later (either before, on, or after our date) that they have boyfriends. Usually I just delete their number, facebook contact, etc. I don't have time to deal with girls like this. Recently this happened again but I'm considering to not do this. I'm thinking about still going out with her but I don't know if it's worth my time, I'm looking for a gf not a friend. What do you think?
i don't know why these girls are going out with me. maybe because I'm better looking than their bfs or maybe because I'm fun to go out with. It's been a while since I've found a girl that didn't have a bf (well I've found one that doesn't but she's underage so screw that).