I don't think Manatee's post is more balanced actually, I think it's simply more imbalanced in favour of DH, and doesn't really grasp the destructive impact of his behaviour. It takes at face value the assertion by the OP that she's being 'critical', without evaluating adequately the context in which this accusation has been made by her husband.
I've no doubt the OP has her faults, I've no doubt she may find better ways to manage her reaction to DH's behaviour. But DH is behaving in a way that makes family life difficult if not impossible to manage and would do for anyone:
This is exactly how I have been dealing with it until now. Just getting on with life/trips without him. But its a rollercoaster because sometimes he wants to be involved and is involved and other times he promises to be involved and then doesn't turn up or comes up with work/some excuse. Its frustrating to never know whether he will fulfill a promise or not (or even live up to his responsibility). Its frustrating to not be able to rely on him because there's a 50% chance he might let you down. It is a bit like being on the edge, because he is there, he says he wants you to rely on him, but you can't
This is not 'normal' behaviour, anyone would struggle with to make a relationship work with partner who behaved like this. He's very selfish and he's not working in a team. More than that he's constantly wrong-footing the OP, so she feels there is no solid foundation beneath her feet.
This is a method of control.
If he behaved like that at work he'd be fired, because you cannot work with someone who can't rely on.
At home, he can get away with it. Thus far he has been successful in deflcting any attempts by the OP to address his behaviour by counter-criticising her. She goes away and examines her own approach, thus the spotlight shifts off him, he gets to carry on his patterns regardless of the impact on her and the family.