He can't control what the gf does. She shouldn't even have your mom's number much less be texting her.

I think he may be feeling trapped and trying to distance himself from you since your relationship seems to be antagonizing his current relationship. And he doesn't know how to do it in a constructive way. If he is going to move on he needs to cut his ties with you. He can't move on while still taking care of you.

I know that it is scary to have to make it on your own but that's the direction you need to take.

Don't put up with the abuse.

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