If it was worth it, I'd wait for them. If not, I'd try to move on.
Right now I am kind of in this situation. I like this guy, and he has like 3 other girls since I've known him, which isnt a long amount of time at all.
I find it kind of silly, but I'll just sit back and see what happens.
If nothing happens, I'm okay with that. I'd rather have him as a friend then not have him in my life at all.