My ex-husband would start out very friendly and jovial.
It would slowly slide into speaking louder and getting argumentative.
Then inevitably, he would get so loud and obnoxious he had to leave where he was under the threat of police being called.
this would happen in the course of one evening.
I was a miserable drunk, just depressed, withdrawn, a shadow in my own life.
Please get some help for you, it will not improve until she wants to.
Beth