Wow OP talk about poor communication. I think it would help you to read your posts again when CALMER as right now you are on the defensive.
You 2 are in a relationship and you are showing your children what a relationship between a couple looks like.
You both are childish and immature in how you react.
I suggest you ask your partner if you can sit down and talk about what has happened. An apology is owed on both sides and that should be your starting point to discuss the issues in your relationship.
Look at it from a shouting match your children have just had, one has stormed off to their bedroom slamming doors as they go and the other child is pacing angrily downstairs.
What would you say to them?
Would you suggest a time out? To cool down & then to sit down and talk about what happened? Would you want to know why their conversation turned into a slanging match?
This is everything you would say & more because you don’t want them to be unhappy and you want them to understand what was so triggering that took a conversation from a 0 to a 100.
This is no different to how you need to address things with your partner rather than reacting in the manner that you did.
A bit of respect would go a long way as would taking accountability. You may want to get off your high horse because you don’t like the fact posters are honing in on your reaction. You lied to your daughter remember when you downplayed everything.
Seriously right now you both sound like children. As a couple your communication is poor and you both need to do better.
Remember we need to set a good example to our children of what is healthy in a relationship. Screaming, shouting and storming off are the exact opposite of that.