Though I was not married to them, I lived with 3 girlfriends, one for several years so we may as well have been married. I am still friends with all 3.

Though the initial breakup and few months which followed were difficult, eventually I was able to maintain a friendly relationship with them and though it was many years ago, I still talk to 2 of them on a regular basis. We share stories of how our lives evolved post breakup and give each other advice. It's turned out o.k. for me. I hope this was helpful in some way.