I (45f) am recently divorced. I decided to try a dating app for the first time. What I have found is that the majority of the guys on the app are married just looking to hook up. So I will go on dates with these men and if they sleep with me I do a little Facebook research and contact their wives. To let them know that their husband is a cheater. Most of them seem more upset with me than their husbands. I hadn't told anyone I was doing this but I finally told my best friend about it and she looked at me like I was a monster. I told her I was helping these women by telling them what their husbands are doing but my friend said I was the asshole that if I knew they were married why would I sleep with them.

So am I the asshole?

EDIT: I worded it poorly. I usually research prior to meeting for safety reasons.