Baby Mama Drama

BM has continuously disrespected me and my daughter and treats me like shit. And all day today she’s been fighting with me trying to start stuff while I ignore her. And then she texts DH at 9pm at night and acts like they’re best friends and sends a bunch of pictures of my SKs joking and such. Am I wrong to think that he should have ignored her and be mad at him for being friendly and responding to her after she treats me so badly? I get they have kids together but I think this level of friendship when she treats me so badly is is very disrespectful of him to allow.

I’m trying to understand other points of view so please dont roast me.