I agree with you spidermomma, these feelings of hatred develop over time, they are not immediate.
I loved and adored my DP in the first few years we were together, and particularly thought he would be a great Dad because of how he seemed to be with his DS.m, when we didn't live together.
Over the more recent years we've been together I have grown to dislike him due to his behaviour. As an example, I have no evenings because he does his hobby every evening, and won't put the DC to bed. DD3 has SEN, so it takes a couple of hours EVERY NIGHT to get her to sleep, and by that time, I'm exhausted too. I have no time in the morning, as he sleeps in until past 9am sometimes, as he's so exhausted from doing his hobby until late into the night, and he won't get the DC ready for nursery/pre-school, or give them breakfast.
I work full-time, so during the week, I have no time to myself due to him being a selfish bastard, and that's a kind description of him.
The only time he will take the DC is for a couple of hours lie-on on Sunday morning (i.e. now). However when I get up I'll have to do everything, as he won't have given the DC breakfast or bathed them, but he'll behave as if he's Dad of the year because he's given the DC a beaker of milk each to drink, and plonked them in front of the TV while he lies on the sofa
.