What Do I Do?

So, I'm dating a girl and I really like her a lot. We've known eachother for about a year, we've been together for around a month or two, and we have a bunch in common. She's always been sweet, but she sort of acts really rude to anyone she doesn't like (and most of the time these people are rude first).

The thing is, though, that I've also met another girl. I started talking to her about a month and a half ago and we met through a play we're both in, and she's really great. Very characteristic, funny, and pretty. The only issue is that she has a boyfriend, but he pushes having sex onto her a lot though she's made it clear she does not like him. She's always flirting with me in front of everyone and has even texted me about how she likes me.

I like them both a lot and they both mean so much to me but I don't know what to do. Should I just end it and stay single until I can make a good decision or should I choose between them?

edit: I ended up breaking up with her, for now I'm just gonna stay single!