What Should I do?

I think I'm starting to like my bffs ex (she broke up with him cuz she doesn't feel the same way anymore) and I think he likes me back. (He's doing pretty much the same stuff with me as he did with my bff when they started dating and when I skyped him Friday night everyone was asking if he likes me and he told me he does but he's not Mean enough to do that to my bff.) I don't want to lose my bff for dating him if he does decide to ask me out. Although since they broke up she's barely been talking to me and her ex has been talking to me a lot more. Please help
What Should I do?
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