Did I do the right thing for dumping my partner of 6 years whom we have a child together because she sent a picture of her breasts to a man?

I have a friend that just experienced the same situation. He came downstairs in the middle of the night to see why his wife hadn't come to bed. She was on the computer topless showing another man her breasts. He divorced her and got custody of their son. I don't think you are being petty, but maybe counseling and computer limits would help.

Edit: you should thoroughly look at your replies correctly because I didn’t say petty lol 

Why wouldn’t you be right to decide if you want to be with someone or not. That sounds pretty understanding to break up with somebody over that