If a man is engaged, what reason would he have to be upset if a female wanted to move on?

My ex is engaged but he won’t compromise on a schedule for our children because I plan to move on. Why would that be? It’s clear he made a decision on where he wants to be but clearly doesn’t want me to do the same.
If a man is engaged, what reason would he have to be upset if a female wanted to move on?
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