Should I listen to a friend who wants me to cut off his ex, even though I knew her for longer?

Anonymous
My friend got cheated on and he insists im not a real friend if i don't cut his ex off. And though me and him are closer. I knew her longer. So I feel as if im placed in a situation that has nothing to do with me. She gets upset when I ignore her and he gets upset when I reply to her. And he regularly asks to see if I've been talking to her. I think this is childish but I don't know what to do. I feel bad because he has done a lot for me in the past and I've done a lot for him but I don't think that should define what I can do.
Cut her off
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Don't cut her off
Vote B
Cut him off
Vote C
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Should I listen to a friend who wants me to cut off his ex, even though I knew her for longer?
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