My mother cheated on my father and he left her because of that.
He was required (by Texas law) to pay child-support to my mother up until we were 18 (I am 29) to my mother who cheated on him; he still owes back pay on that and refuses to pay until they put a warrant out for his arrest.
My mother demonized him to us by crying about not knowing why he left her; she never once mentioned until 5 months ago that she cheated on him.
Dad regrets leaving us (his kids, not my mother) because it put a rift between us. We never knew the truth until recently when my mom let it slip in a conversation.
At this point I feel like he has been punished enough by the state of Texas for leaving my cheating mother.
Recently my eldest brother had a girl and my father has been in her life as much as he can and I'm incredibly happy for that (not jealous one bit) because at least my niece will have something my brother and I never had because he was soured by her behavior.
We grew up poor because of my mother's infidelity...