My half-brothers and my father both had a mutual hatred and my mother was really affectionate with my father.
The only example I can think of, was them both hugfing in the kitchen when I was really young.
They both slept in the same bed, but sat on opposite sides of the sofa.
In the end, my father was just a piggybank so my mother can raise her bastards until they were old enough to look after themselves and so she can get a job and earn her own finances.
They divorced when I was 10, conveniently during that time, my half-brothers were 15, 16, 18 and 20.
And yes, he had to move out the house that he and she paid for together and live with his older bipolar boomer sister (my aunt).
Being a stepfather is a form of cuckoldry.
You are raising the child of another man who fucked and cummed in your wife/gf.
The child will be a constant reminder of the fact that another mans penis and sperm were in your wife/gf.