I have, my now ex husband was an online cheater, they were all emotional affairs and for various reasons I don't believe they became physical.
I've posted before about him so apologies for the repetition if anyone has read my story before.
My husband had emotional affairs from year 1 of our marriage and I wished I walked away sooner, I eventually left at year 17. I can assure you that 99.9% of them do not change and probably cannot change.
I didn't leave for various reasons - low self-esteem, pride, fear about my kids, all sorts of things. Early on it was also because I thought he couldn't help it due to his terrible upbringing.
After I left I realised how emotionally (and financially) abusive my marriage had been so that was likely another reason. I was so out of sorts from that I couldn't see the wood from the trees and lived in a state of hypervigilance.
The first time I caught my husband he denied it despite me seeing it with my own eyes. He behaved for a few months and then did it again, this time he admitted the previous emotional affair and denied the new one. That cycle continued for years until I reached the point I no longer cared and stopped checking his phone. I have no doubt he continued having emotional affairs as he was always glued to his phone.
His emotional affairs were usually with people from Facebook, usually friends of friends or people he knew from years ago. Once it was a very pretty work colleague.
My ex-husband had low self-esteem and confidence and did it for an ego boost.
When we eventually split and he moved out, despite me telling him it was over he thought I was just punishing him and would let him back so a while later when I met someone else he went absolutely mad, stalked me, broke into my house to steal stuff, just generally was mentally unwell and attempted suicide a few times. He was also sectioned.
Despite him begging I never went back. He told me he did it for the ego boost and never planned to leave me - gee thanks!!
I'd grown in strength and could say no. I told him it was the lack of respect for all those years that ground me down and there could be no going back.
My ex has also been a Knight in shining armour and I think this is where most of his emotional affairs started, women would post on Facebook something negative and he would message them being supportive and it would grow from there.
He hasnt changed at all, he started supporting a work colleague with her difficult marriage and they used to message a lot and spend time together and it became an affair and then she left her husband and they now live together.
The only problem being that she moved into the house my daughter lived in with her Dad with no warning or no meeting and so my DD promptly moved out as she didn't feel comfortable in her own home. (DD still did 50/50 between me and her Dad even after she left school).
The relationship between my DD and her Dad is hanging by a thread and has done for the last 18 months which is very hard to see.
My advice would be to run and don't look back.
You're independent and you can do this.