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Throwaway account due to personal reasons.

My bf and i (both 27) have been dating for around 4 years. He has daughter from his previous relationship(it was a teen pregnancy situation). His ex gf has the full custody of their daughter but my bf loves his daughter so he is still in her life which is fine with me. They coparent sometimes but my bf talks minimum with his ex.

They have a movie plan tomorrow which includes him, his ex and their daughter and some other bunch of friends and their spouses and kids. I didn't have a problem but tomorrow i have a family function and they invited my bf too.(it is a sudden invitation)I want him to attend so i asked him if he could cancel the movie. My bf talked with his daughter and the other friends and they were okay with. But his ex isn't certainly okay she is telling him it's a bad look for their daughter because according to her "parents" should have some quality time together for healthy upbringing. I told her to stop with the crap and blocked her. Now my bf's daughter is kind of sad because her mom i think she manipulated her but he handled it. So aitah in this situation?

Edit: i didn't demand him/force him. I just asked him and he enthusiastically said yes because he has spend the last 1 week with his daughter.