Our expert says:
You don't mention your age or his, and whether your mom is alive or dead, still married to him, or divorced. If you call it an affair, I'm guessing she's alive and they're married.
You seem to be saying that your mother, maybe not deliberately, tended to make your dad and others unhappy, so maybe he deserves a little happiness in a non-painful relationship, and maybe he's sticking with her because she is so very dependent on him and too prickly and maybe not of an age to be likely to find anyone else to care for her. You seem tempted, understandably, to accept the relationship as it is.
YOu seem to be assuming that your mother doesn't know anything about this, which may or may not be true. Maybe you could, if this really troubles you, talk it over calmly and privately with your dad ?
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