<human>: In the summer, my gf of 4 years and I split up. We have children together, at the time both under the ages of 3. Since then, she has moved out and started getting herself set up while I kept the house. 

About 2 months ago, I started seeing someone and things have been going well. The issue is my ex knows and dislikes this woman (not the reason I started seeing this woman) and keeping a balance where everyone is happy and not ragging on me has become difficult. 

My gf and I had talked about doing dinner with our kids (she also has children) to ring in the new year, then I would bring them home for their bedtime. Not wanting to feel like I was withholding anything, I informed my ex who has expressed not being comfortable with this. 

I asked her if it's because of the particular woman I'm dating, or if it was because I was already dating. Apparently the answer was both, and if it was someone different she would want to meet them and at that point give me an ok to have events like this with them. 

We're both in our late twenties, so this seems a little insulting to me, as if she's still trying to control what happens in my life despite choosing to no longer be a part of it. 

Does she have any merit to what she's saying, or should I simply tell her that's not practical and we're both going to date whoever we choose to?

Summarize the given text in a few sentences.
<bot>: Ex (mother of my children) doesn't want me to have dinner New Years Eve with my gf and her child.