A woman has been left mortified after spotting a friend's husband on a dating app.
After scrolling through Bumble, she came across her pal's husband of four years who seemingly was looking for another love.
Unsure of what to do, the woman anonymously took to parenting forum Mumsnet to ask for advice.
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She was faced with two choices - to tell her friend or to keep silent.
She wrote: "I seen my friends husband on Bumble on Friday night.
"I made video screen shot of entire profile - verified and fully filled out.
"I was at their wedding four years ago, she was fairly smug with how well their relationship had gone. Engaged after a short period of time, and married after one year."
She added: "They met the week after she had a six year relationship ending and they did seem literally perfect for each other.
"I tend to stay away from gossip but neither she or anyone else have intimated their relationship has broken down.
"I have told no one I know about the dating profile.
"AIBU [am I being unreasonable] to leave it and feel it's none of my business?"
The post has quickly gained over 80 comments with people putting their two cents in.
Some shared their own stories of being in a similar situation while others suggested what the woman should do.
One said: "Tell her. I told a friend, she thanked me, chose to stay with him anyway and I haven't heard from her since. But at least she knew and wasn't being made a fool of, and could make her own decisions."
"Tell him you've seen it", another butted in.
To which she replied: "Good plan. Just forward the video and say - ‘not sure if this is a fake profile’?"
But that was quickly met with warnings.
Someone else jumped in: "I wouldn't tell him! You'll give him time to come up with an excuse. Your loyalty is to her not him!"
"Don’t tell him - he’ll delete it and then you’ll only have to tell her anyway or she won’t know she’s with a lying sh**bag. Send it to her anonymously if you can’t face telling her, but definitely tell her. At least give her the option of divorcing him. Hopefully they don’t have kids yet", a second echoed.
A third wrote: "If you like and respect her - tell her the facts directly. Otherwise forget the information completely."
"Please tell her otherwise she's being betrayed twice", another begged.
Meanwhile the woman was met with more caution as one Mumsnet user shared her own experience: "Just beware that it can go horribly wrong.
"I saw one of my friend's husbands on Happn when I was single. She wasn't a close friend but someone who I knew through a much closer friend of mine.
"I told her (the wife) and then got ostracised for causing trouble. Was told I was making it up. I got blocked by the wife and she sent me a message to say I must have been mistaken and how cruel it was to cause so much heartache to someone and how it must have been a fake profile because it was nothing to do with him!"
What would you do if you see a pal's partner on a dating app? Let us know in the comments.