I think my ex's sister likes me?

I think my ex's sister likes me. At one point I was hanging out with my ex's sister and she was flirting with me, but before that I was friends with my ex's sister before I met my ex, then me and my ex started dating and she used to make comments like I wish I had a man like that and etc well you get the point, but she was flirting with me and she is looking for a roommate and she asked me to move in, I know weird and awkward. I'm looking for a roommate but I think I should stay away from this, what do you think? And what if we ended up hooking up? She is pretty but her whole family knows me and it could never be more than sex
Updates:
+1 y
Also would it really be wrong if we hooked up?
I think my ex's sister likes me?
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