AITA for telling my sister that her boyfriend is weird or has been misled for thinking if a woman loves a man, she will let him see her doing #2 in the bathroom ?

I'm (31f) a married woman, and my sister Zoey (20f) (no real names are used) asked me if allow my husband Brad (32m) to see me do #2. I told her yes, all the time. She asked if it's weird that she doesn't let her boyfriend Pete (19m) see her do #2. I told her it's not weird. She asked if that means she doesn't love him because he said that if a woman loves a man, she will allow him to watch her do #2. I told her that's not true. That Pete is weird or has been misled.

I told her that when I was in college, there were guys who saw me do #2 and I didn't love them. That's it's just a comfort thing,not a love thing.

Zoey and Pete ended up in a huge argument, and they broke up. Pete has been going around telling people that I sobataged their relationship, and that I'm a meddling older sister. Did I overstep ? Am I the asshole ?