Thanks to everyone for their kind words.
I suppose I have just recently been thinking that even though my dad kind of "pulled the trigger" by doing a bad thing, there is still blame to go around, and the situation could speak to his genuine unhappiness with my mom. It doesn't excuse him for being a poor communicator and making mistakes, but I don't know how exactly the disloyalty unfolded, and... if it's what he wanted, it's what he wanted.
I don't have to like it, but I accept it's a legitimate reflection of issues in their marriage.
I think that's a very mature and forgiving way to look at it (and I mean 'forgiving' in the best way), and certainly more equanimous than I'd probably be able to manage if one of my parents cheated.
Poll
