Love Triangle (kind of) over need advice?

This is a long one. But, I feel the more details the better.
I was having a threesome with a friend and her girlfriend. Which ended recently (their relationship) due to difficulties they had with each other nothing to do with me (they say).
Now one of them likes me a lot to the point where we are trying to see where it can go. In terms of potential dating. Her EX (My friend) said she is cool with us trying. now I do not feel to much for this girl but, i am still trying to see if we could be good for each other the more we get to know.

Am i being stupid? is this social suicide? Shall i just end it? or any other thoughts. please help thanks:)
Love Triangle (kind of) over need advice?
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