Even th most secure can have bouts of jealousy too. I don't think it's about that I think it's about respect for your partner.
I am friendly with my exs...but they are not in my life ....even more so if I'm with someone.
That's not to say that let's say a long time married couple split and have kids together that's different and they are and should always remain a part of each others lives...given they went through a life altering stage of their lives.
But I'm speaking from myself and being childless I don't see why an ex should be an active participant in someone's life who is clearly moved on with someone else.
Once a seed of doubt is sown it's hard to kill it.
He had a rough childhood but came good and is one of Americas leading motivational speakers. I agree and admire alot that he says. But he disappointed me on this one...he holds packed audiences by the thousands and on this particular occasion was challenged by a woman on it. What I will admire about him is he apologised and said he was wrong later.
RE: do u believe in second chances
Obviously.