You're not being unreasonable but views get distorted during break ups.
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It's usually mum who is dumped. She's the reliable family-focussed one. Dad has become this feckless, irresposible one who is thinking of his dick before any considerations of children.
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The break up of the family and stability and routines. And dad is usually keen for the kids to know and love the new person he's met. (Men are generally shite at trying to look at things through a child's eyes).
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The sense of betrayal to both wife and children. Once trust is lost, it's lost.
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The financial imbalance. Dad is usually the higher income earner, because mum is the primary children care taker. And he can afford to take kids out on treats without responsibility or boundaries.
So mums are generally more invested in their children.
But I completely agree with you.
Hint. I know a woman who is a very close friend. She was pursued through the courts three times by ex-partner, not huband. Everytime a court contact agreement was made that provided for up until the age of 18, he started a new court case.
The general approach of the courts is, what mum wants, what dad wants, find an agreement in the middle.
It becomes less funny the third time around. When twice an agreement has been made until the age of 18.
This time (I kid you not) she gave him everything he asked for. Every other weekend year round - not just in term time. Holiday time increased - and in effect 50% parenting.
He lasted less than a year with a 4 year old child, then he took off and vanished from contact altogether. But then he was a control freak more than a doting dad.
So I agree with you.
Not just from the fact it benefits mum, but also from the fact it seriously impinges on newly liberated husband having to take 50% responsibilty for childcare - especially at weekends.
But someone is always worrying about the kids and what they're coping with seeing dad kissing and cuddling someone else - and it's usually mum.