Our expert says:
Him having a new gf obviously upsets you, but is hardly lkely to upset or damage the children, who he is apparently not that interested in seeing much anyway. Its not clear from your message hat the formal situation is - are you and he divorced, or used to live together and now separated ? Either way, if the formal relationship is over, he's entitled to do as he wishes, enter a monastery or become a big-time swinger.
It sounds as though you have invested far too much in this previous relationship, and have given this guy FAR far too much power over you and your happiness and freedom Do see a good local cousnellor to work through these issues and set yourself free. he should now be irrelevant to your life and happiness.
As you say, intellectually you understand what is needed, but emotionally you are still reluctant to clear house.
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