Me and my partner have been together for 8 years and have 1 beautiful son and are trying for another child. Now when my son was just over 1 I found a lot of messages from my partner to other women(I wasn't snooping he was signed into fb on my phone at the time and received a message) these were very flirty and suggestive messages to multiple women even arranging to meet up but never quite getting to that point. In some he said we were broken up and in some he didn't mention me at all. These messages ranged from when we first met all the way up to when I found them, I went mental because through this timeline I was pregnant, looking after our infant son, dealing with my moms cancer and trying to help my sister out of an abusive relationship all while this was going on. So naturally it resulted in a big argument where I nearly left but eventually stayed for our son and the fact that I still love him. Fast forward about 2 years and I again see that he has these flirty message and a POF account where he was chatting to girls, again I let it go after an argument. Fast forward 3 years to last night and I again found that he had been flirting with a coworker, again another argument where he brushed it aside as harmless flirting. I don't know what to do I love my partner and he is great dad, but I'm tired of constantly being paranoid and wondering if he's doing it again. He is my best friend and I can't talk to him about my feelings as he feels like I'm dragging up history, and all my other friends are his friends too so I can't talk to anyone without damaging their relationship with him, so I feel like I'm going mad with the thoughts and feelings swimming around my head all the time. I need some outside perspective/advice so any you can give would be great.