She refused to meet me

My boyfriend seven months and I are having a problem with his ex. His ex is the mother of his child. She said to him that she is not going to let her child around me until she’s meets me. Which is cool because I know some people can be that way. But every time he’s extended the invitation she refuses and gets belligerent. I don’t know what to do at this point. I don’t want to say this but is it jealousy or bitterness involved. Christmas is coming up soon and his child wants to be with him, he and I live together. His ex will not hear of it and she says he should stay the night with their child at her house or forget it