Why is my ex trying to provoke an argument with me?

So without knowing your situation. I'm guessing your ex had to provoke an argument with you because something on their end did not fall into place as planned, so as a way out. They had to point a finger at you

It eventually became an every weekend thing, then her friend started coming over, every single day. She wouldn't leave. And my ex was letting her invade our life.

I'm assuming she was trying to flee from accountability in her life, probably got caught doing something from the new boyfriend she suddenly had, so to get out of the spot light, she had to put me in it.

You hold the door open for a lady and she stops in her tracks and screams at you, ‘Don’t hold the door for me! I’ll get it myself!’ What are your feelings or immediate reaction?

My daughter from a previous relationship would come over, my ex would leave that weekend n party the whole weekend away. Coming back Sunday. Leaving me with the three kids.

Inevitably she had an explosive outrage and demanded I moved out n that it was over.

My ex did this,

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She claimed her friend who was newly single needed her support.

Eventually the phone calls n texts slowed to a stop. Eventually she stopped coming home. And when she did it was instant anger and yelling.

Our breakup process started when she started going out drinking, about when our daughter was 2

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Fast forward to 2.5 years later. The explosive anger and aggression came back out of no where. Long texts, picking fights, threats, anger, rage, chaos.