Dating my ex bff's ex?

Heyyy, soo here's my situation.
I had a friend whom i was very close with, but we got in a fight, ended our friendship and we haven't spoken in 2 years and a half. Long story short several months ago she got a boyfriend and they broke up pretty fast and now he likes me. I doubt he knows about our friendship with the girl, however is it right to date him? I literally don't care about her and she doesn't about me, however is it going to be weird? Or should i just go for it because fuck it.
Dating my ex bff's ex?
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