Roommate is flirting with me without knowing about it!

Anonymous
Alright, this one is a little complicated. I live in a house with 3 girls and one other guy (I'm a guy). We've lived here for a year and a half together. One of my roommates has had a boyfriend since before we moved in together, but about 7 or 8 months ago I got the feeling that she liked me.

Over the summer, her boyfriend left for China for a few months, and I am almost sure that she liked me, but I didn't try anything because I didn't want to be a dickhead to her boyfriend. Then, her boyfriend got back and she didn't show it as much, until recently she has started flirting with me more often. She'll hit me playfully, squeeze my knee sometimes, and playfully tease me.

My question is, does she like me, and if she does, how can I get her to break up with her boyfriend for me without making it awkward to live together?
Roommate is flirting with me without knowing about it!
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