Hi Craig and welcome
((((((((((((HUGS)))))))))))
The feelings will pass, don't act on them. Whatever happens between you and your ex. The kids will always be your kids and they will need you. Nobody is laughing at you, this is your pride talking, don't let your pride take over, it's pride that starts wars and drives people to do things out of character.
talk to someone about your feelings and thoughts, a doctor or a therapist