AIO my best friends dad hit me up on Grindr

Late last night I(36M) was doing some saucy surfing on the saucy app and got a notification I was not expecting, it was a message from my best friends(31F) dad(54M) who is married and worst of all it was a picture of him showing his butthole. I blocked immediately but withheld bleaching my eyes (this time). Both of our profile pics are of our midsections / no face pic so he had no idea it was me before he sent it but I feel scarred for life, we all just went out for tacos a couple weeks ago. Also disturbing is that he’s in a happy marriage with my friends mom, idk if they’re in an open relationship or he’s just being a scumbag. I haven’t told anyone yet but it felt criminal FaceTiming my friend today knowing I can vividly picture her dad’s anus. AIO?