I'm usually done by the time a man becomes an ex that I really don't care. I take my time to dump men, even those who clearly wanted out [deduced from their behaviour] didn't out rightly tell me so, just started misbehaving such that I have to do the breaking up.
I never wanted to regret a breakup hence I'm sure before I take a walk.
I don't feel anything seeing them with others, I hope they are before behaved and treat those women better, and if they were still messed up, well I didn't care, still don't care about exes.
I have one relationship that I still wonder about, I wish it worked out but he was just too full of himself, and I don't envy his present wife, she might have gotten a better man than he was when I knew him. I wanted him to work out because his family was very welcoming and loving to me, his mother treated me very well and the family was rich, I just had to let the fool go because he was overbearing.