I don't know where to start really, this is my first time here and posting for help, so please excuse if this is in the wrong place.
I have been with my partner 21 years, in year 16 I found out that he has been cheating with a co-worker, when confronted he ended things with her and claimed he was cheating as I was ill with depression and he felt he had "lost" me at that time. I went to counselling, went back to my GP and worked on getting better. I blamed myself for all that had happened (On reflection he was eager to blame me too) and worked hard to try to reconnect with him. One year on I found a phone hidden in our bedroom, when I turned it on there was no calls, or numbers saved, just nothing, checked the internet history and it had a gmail account with the password saved. I know it was wrong to log in but I did. I discovered he had been using sex workers for about 6 years, I saw the emails, appointment times, "services" he ordered and how much he paid, he was a member of an escort website that allowed you to book women and then leave reviews after. I have read his reviews of his experiences, seen photos of these women and my heart was broken all over again. He claimed this was a compulsion for him, that it was nothing to do with me or anything I have done and he went to counselling while angry at me, life and being discovered. He then decided that he needed time apart to help us reset and get back on track, he moved out temporarily (three nights a week) to give us space to heal and work together to be more united. He moved back home full time after 8 months. That was two years ago, last week his first affair partner showed up at our home to speak with him, he told her to go away he never wanted to see her again. She came back the next evening to again speak with him. It turns out during the time he was healing and needed space he was still seeing her and then coming to me on the other nights. He has been in contact with her to various degrees since I first found out about them cheating. It ended up with me consoling her on the doorstep and hugging her when she broke down crying.
She has been in the background of our relationship for the last five years, it has now emerged he has been cheating for about half of the time we have been together, in one 18 month period he joined 27 different no strings attached hook up sites, he has spent a lot of money on escorts and web cam sites, it is endless. I feel numb, this is my third time dealing with discovery and I don't know if I have the energy for it again. Her turning up at our home frightened him, and he has for the first time volunteered himself to go to counselling, he has found and booked an appointment for a therapist who specialises in sexual addiction and seems eager to engage with them. But I just feel numb, I swing between anger, grief and numbness, sometimes I think I am doing OK but then it all hits me again like a wave, I cannot eat and am lost. He is making all the right noises about getting help, but he also said and did all the same things when I discovered his infidelity twice before and within weeks he was back cheating again. How do I know what it genuine any more and how do I keep my own head above water while I decide what I want long term? I have a background of childhood sexual abuse and my boundaries and self esteem are not good, I sometimes feel he is with me because I am easy to manipulate and blame for his actions, his behaviour feels familiar to me as it feels so similar to my childhood abuse. When I discovered his use of escorts he told me that it was because I was abused as a child, that when he is with me that is all he sees or thinks about. Any help would be greatly appreciated. Thank you.