I'm a bridesmaid for my friend's wedding. On May 13, 2017 they're getting married; which is their 5th anniversary of dating. While home for Thanksgiving, I was scrolling through Bumble (online dating) and saw my friend's fiance!

I'm trying to give him the benefit of the doubt because I've known him for years and I cannot believe he would cheat on my friend. Because I didn't think the site was that old, I looked up when it was created - December 2014 which is right around the time they got engaged (so it's not like it's an old profile from before they started dating).

Should I tell my friend about her fiance's online dating profile, talk to her fiance about it directly, or ignore it? What do you guys think?