I have to ask, would you ever want to get back in contact with her? Try it all again, or at least try to clear the air? I've always wondered if I should myself, because I would give the world to fix things, but I'm always worried that I'd make it worse.
Probably up there for me. It was completely by accident.
I tried doing so. She wasn't interested a couple of years ago. We broke up about 5 years ago. We exchanged some messages some time ago, but very superficial stuff, mostly hey I'm alive hope you are doing well kind of stuff. Probably too late now, she has her own life and stuff to deal with, I'm likely not something that is relevant to her in any way anymore.
Understand your last part. I would have sacrificed so many things to fix the situation previously. The temptation is still here, even after all these years. Yet now, I am not so sure. Perhaps it is best that some things are left in the past.