Please get with a db coach, they will help you. You are not in a db frame of mind if you are thinking of buying him a watch, inviting him to dinner and so on. Birthday or not. This man has left his family to be with another woman. I would not want to have dinner with him while he is doing that.
By the way, next time he says he cannot fit the kids in his schedule and moves a scheduled date for pick up, simply reply, "sorry, they are yours that night, I already have plans."
Get that coach, it will make you feel more confident in the choices you are making for yourself.
