There is no thinking about it for me. LEAVE with the knowledge that I had loved and lost, but chose to be good to me!!! I deserve nothing less than the best and all that someone has to offer, not the left overs. Eventually, it would be the same scenario over and over again. I would see them out together and be heart broken, come home and get all emotional and he would come in and tell me he loved me and I would cave and stay.
No one deserves second best or second place. I've been second place in a relationship and know how it feels. Never again!!! Maybe that's why I have been single for the last 20+ years and, at the age of 50, will probably be single until I leave this earth.