I understand xactly where you are coming from.
You are saying exactly what DH said and I feel really sad realising once again how he felt!
She probbably has good reasons to be angry but there is good channce they stem from self issues rather that relationship ones. That is often the case. And if you look at the way you handles last night, you are probably doing it too. You admit yourself that your ddeadly calm was provocative.
What both of you want at this stage is total honesty towards your partner. That starts with total honesty towards yourself. You both need to learn to recognise the patterns of behaviour/discussion that lead to an argument.
ie:
she snaps at you or the kids for no reason, you try to calm things down but with that tone of voice or look that means "here we go again", she gets angry, you pretend you are calm, she sees it at a provocation and engages in argument, you thinks she really means it and you start pouring out your heart (that's where we are wired differently......she just wants a fight) and then (because she just wants a fight) she realises she can not handle this discussion and becomes dismissive.
Hope you get my point. It's a bad pattern. we all do it, we all know it's pointless. you BOTH need to recognise it and decide TOGETHER:
- OMG, we are just being silly again, shake it off with a laugh
- OMG hold on a second, you really hit a sore point there. Let's stop this ridiculous argumennt and sit down and talk this serious issue.
At the end of the day all this anger is just such a waste of those precious little times that we could be spending together as a couple. (And God knows that's not often with toddlers around)
You don't want to be one of this couples that suddenly wake up when the kids are grown to realise that you have nothing in common and you wasted 20 being unhappy?
Tell her that unhappy you are. Not angry, unhappy. Try to make her realise that her anger=misery. You can still argue that's healthy, but she's got to sit down and get to the bottom of it and understand why she is angry and not let this anger take over her whole life!
(as a clue, my unhappiness stems from being an expat wife and not being able to get my career back on track and lack of self esteem thereof)