Replying to The all mighty NS ladies help.

So I need to all mighty NS help that pertains to females. I was dating this girl for a good 6-7 months. Some girl has been pissed off about me dating her for the whole relationship and decided to get even and say I was cheating on her. My girlfriend broke up with me and now its about 3 months later. I still want to see if there is anything there, that maybe I can build on but how do I figure out? we hang out sometimes but only in our group of friends never really alone.