Do I like her?

So... there's this girl (which is my flatmate) and we get along pretty well. Sometimes we do flirty things, but only sarcastically, or just jokingly, and everyone else in our flat says "You 2 make such a cute couple". Well, I never did anything about it. We've lived together for 8 months now and we're still nothing more than just friends/flatmates. I didn't think I liked her in that way until now... now she has this guy that she's been recently seeing. I'm all of a sudden extremely jealous, and I don't know why. I didn't think I liked her that much But she's been on my mind constantly lately, which is weird. So do I actually like her, or am I just being a possessive bitch? I'm so confused, and I'm not the best with dealing with these emotions.

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