Why do friends sleep with their friends exes?

I hear of this way too often, even on here with people asking questions about it. Why is it so common? Especially if friend knows their friend isn't yet over their ex or it's a recent breakup, it's betrayal 101.

What do y'all think about when a friend fucks their friend's ex? Have you ever had this happen to you? Have you done this to a friend? What would you do if your friend slept with your recent ex?

Why do friends sleep with their friends exes?
Why do friends sleep with their friends exes?
Why do friends sleep with their friends exes?
Why do friends sleep with their friends exes?
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