Is AUTHOR wrong in the post ? POST : Throwaway for obvious reasons. Friends know my account and I'd rather not have my family's dirty laundry aired to our whole community. 

&amp;#x200B;

Anyways, my parents are in their early 60s and have been married for 40 years. My mom has jokingly said years before that if my dad ever cheats on her, she doesn't want to know because they've been together for so long and she doesn't want to split up. She's said that if he does do anything, all she asks is that he never tells her to spare her the heartbreak. My dad would laugh and call my mom overdramatic. It was all very lighthearted/jokey and I never thought she meant it seriously.

&amp;#x200B;

Well to keep things short I found out that my dad was indeed having an affair in recent months. It's this woman from one of his hobbyist clubs and according to him they slept together twice and that's it. I sat on this information for a few days and ended up telling my mom. I just knew that if it were me, I'd want to know what my husband did. Well, she blew up...but not at HIM but at ME. She's mad at him too but seemingly far more mad at me. She said that it's on me that she's feeling like this and why couldn't I just respected her wishes when she's said it before to all of us. I couldn't believe what I was hearing and my siblings and I all think she's a bit delusional now. Well, except for my husband, who thinks I overstepped and was definitely TA. I don't agree but would like some thoughts here. AITA?