Does she like me or is she just playing with me?

I think she likes you. I wouldn't want you to be the guy that is her "cheaty". She obviously likes you but I wouldn't suggest dating her. She would just find another guy to be attracted to and leave you for him.

Hm how does your friend "know for sure" she has a boyfriend.
If you asked her and she said no then I guess try and continue the relationship
If you find out she does (seeing her out with someone) let it go for sure.
Nobody needs a liar. A little FYI most girls will tell ya upfront if they have a boyfriend though.

Your friend might be mistaking but if she really has a boyfriend and is not telling you so you hang out, Means she likes you

She's trying to decide whether your cooler than her boyfriend. You're not doing so well asking her about him, I'll tell you that much.

First off, why do you care who she calls her "boyfriend"? What's that guy have anything to do with you? If she's spending time with you, enjoy the time, have lots of fun, and leave her wanting more.
She'll quickly stop seeing the other guy.

If you start acting all insecure and bug her about her "old boyfriend", you're just going to send her straight back into his arms.

That's kinda of how it works bro. GL.