I dont think women need a reason to be mad.....I think somedays just waking up is enough.
Many of them aren’t even mad. They just don’t feel fulfilled BUT they are also partially busted, empty vessels. You can’t make them happy and they can’t really be happy.
Hate to hear you are going through this. It’s worse when children are involved. I got divorced from a woman I’d been with for 20 years.
Keep your head up, on straight, and make sure to take care of yourself and your daughter.