So,

I started seeing this new chick- we were sort of acquaintances before, she asked me out, weve gone on 3 dates at this point. She seems like a nice girl and I could see a potential future with her but Ive run into a bit of a problem: I just found out through a friend that she's still talking to/sleeping with her ex. Now, its not like we're exclusive or anything so I can't hold it against her, but do you think it's best to just cut her off? Seems like it could be too messy if she still has feelings for the old guy.