I met ex boyfriend in May 20 during the first lockdown online. We vaguely knew each other from school and were members of the same sports club at the time. We are both mid 40s.
The relationship became quite intense, quite quickly with lots of time spent together and we bubbled up. It was just us for a significant period. Video chats every night,daily messages etc. A lot of it felt quite magical and that falling in love feeling.... until it became toxic. I felt controlled, used with little digs, put downs, triangulation etc and mind games.
This went on for almost a year.
I eventually ended it and was getting myself together when he emailed me to tell me that 5 weeks later he had slept with someone else he met online and was a mess. I still had feelings and rightly or wrongly I went back. I think there may have been a period where he had us both on the go. I got away, it was extremely difficult but I 'escaped' so to speak.
It was fairly easy at the time to work out who this woman was as I looked on social media. She probably has no idea that we got back together briefly.
She looks lovely and seems to be successful. I know my ex has narcissistic traits and was extremely cruel to me. I've had counselling and managed to pull myself back around, almost, 1 year on. New job etc trying to move on. I still feel quite damaged by this relationship and feel it almost unfair he got the happy ending. Not sure what I'm looking for. I just find it unjust after the appalling way he was with me he has seemingly met someone who seems nice and is happy. I know these are just thoughts and the reality may be different and in fact, I perhaps should feel sorry for her. Or maybe their combination is better. Anyway, I'm giving them too much headspace. How do I fully move on? I feel quote damaged by him 
I.wont go into too much detail however I believe I suffered a sexual assault by him. I just have to let it go.