Got into a fight with his bbymomma and got the anger out on me

My bf got into an argument with his children's mother/ex wife because she took his kids out of the country without his permission. He's telling me through msg and I'm being understanding and just giving logical advice, being an open ear. He gets out of work and calls me through whatsapp and I can't really hear him but what I could hear I answered - I told him I was watching a show on netflix. He lost signal and it said "reconnecting" and cut off. I sent him a msg and said "I think you don't have good signal it cut off"

He told me

"Keep doing what your doing bye

Bye"

I said "but are you getting mad at me? I was responding to you"

He said " you didn't say much. You can't call back for fucksake?!!?"

So I called him back. He answered and said "fuck off. I don't need this right now"

I sent him a msg saying "don't get your anger out on me please because I haven't done anything to you. Goodnight"

He replied "you have a small brain. You couldn't call back!?!?"

I responded " don't offend me. I'm talking to you nicely. Don't get your anger out on me because I don't have anything to do with your issues going on right now. I called you back right now and you were rude to me. Bye"

He replied "you only called me back because I told you too. Your small brain doesn't give much thinking to anything!"

Im just not replying anymore. I get it he's frustrated about what's going on but he shouldn't be getting it on me. She always gets under his skin all the time and I'm always the one who gets the short end of the stick. I feel like he really wants to be with her so bad and I'm just the 2nd option and her ghost will always be a problem haunting over us