Last year I started a fwb with a guy at work. I was off work sick for 4 months and during that time he started messaging me. He told me he was single (recently split from his partner) and there was no sign of him being in a relationship on his social media. This carried on for 6 months. He was all lovely but then little details started creeping out, he had been seeing 4 girls prior to me (while still with his gf) and other such stuff. I then found out he was actually still with his gf and had started messaging me 3 months after she had had a baby. I have heard all the excuses, only together for the kids etc etc. I have been off work this week but messaged him to change his van route (which he has told me he can do) so he doesn't have to come to my shop. I don't think he has done it from what I have heard so will have to see him twice a week. Should I inform his partner? One of the things that came out later on was that he never uses protection so he has put me at risk as well as his gf. I think I would want know.