Aftermath of Separation

I got divorced recently after years of struggling in my marriage. Still trying to find myself, you know? Well, I met this guy online who understood me better than anyone else ever has. We started talking...and then we connected on another level that was purely about the physical. It wasn't cheating really, since I'm separated now...but there's still a part of me that feels guilty for not telling my ex-wife until it was too late. She deserves to know though....sooner or later, she will find out what happened between us and how much it meant to me.