Question about single parents dating?

I am a single mother of 3 and I am 30. My ex fiance, as of last night, is a father of 2. His girls are teenagers, my kids are 7, 4, and 2. He left because I told him that if his 16 year old was going to live with me then she would talk to me and my children in a respectful manner. That she had no business bossing my children around, I am there mother. And I mean, this girl is very disrespectful, she went up to the jewelry counter after I purposely lost her to buy his engagement ring on fathers day, and asked how much it costed just as an example. She is just rude constantly. Anyhow, I love him, but he left me, but, was I wrong? Also, I said that it is not healthy for her to lock herself up in her room constantly. And I don’t think it is. I think he should be a father to her. The girl never smiles. I don’t know, was I wrong for demanding that? That she speak to me in a respectful manner? Is that to much to ask?