I recently became single, and joined a dating app to see what's out there. And much to my surprise. My friend' that I've worked with for 2 years boyfriend was on there. What's even weirder is I just went out with them last weekend and they seemed happy. So I thought maybe he was a old profile so I had another friend that they don't know message him and he was all for it flirting and saying he wanted to meet up. My other friend just blocked him so he won't bother her anymore. So I have no idea what to do. My 1st thought was to tell her but they might have an open relationship or something. ????