Boyfriend coparenting with ex wife but talks about her all the time normal?

He says something negative then when I comment he gets defensive of her … always about what mood she was in that day or what mood ahe will be in next week. She’s nice today a bitch next week.. she took the son on his paper round with him and kept half the money for herself which is ridiculous in my opinion and he said she did that and it was wrong then when I mentioned it he justified it ! How?
what to do? Opinions please?

Boyfriend coparenting with ex wife but talks about her all the time normal?
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