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I don't think you do get over it. I was just reading your thread about the grandparent visit, and that is the kind of thing that won't end until they are all 18 and can handle it themselves. And even then, there are weddings, births of grandchildren. etc. Our lives are linked forever--oh, wait yes, that's the way it was designed :) Our poor children get caught in the crossfire, even when we do our very best to handle it amicably...
I hate divorce! But I also remind myself when this happens that before, my life was like this 24/7. It reminds me that I did do the right thing! And so did you...limited, supervised contact with your stbx for your son is better than being reminded daily that his father doesn't care about him.