Really wanting to move but gotta take ex’s new gf too 🤬?!?!

My ex and I share custody of our two kids and I really want to move. I’ve been trying to get him to agree to change our custody agreement so that I can move and take the kids with me and he can get them for winter break and summer vacation but he refuses. Well now he comes to me asking me about moving. He wants to move and suggests that we both move so that we can keep the same custody agreement. My problem is that I don’t wanna move where him and his gf wanna move.....although I don’t really know where she wants to move. He’s making it seem like me and him can talk about places to move but I know that the only person he really cares about his is stupid gf. Example...I have family in NC so I said I’d be cool moving there. He said he needed time to think about it then he comes back to me after a day or so and says he agrees with NC. Well I later find out that his gf has close family in NC so I know he went back and “consulted” with her before giving me an answer. Now I’m like screw it. I’m not here tryna make life better for HER. It just irritates me that my life is in anyway affected by anything that has to do with this woman. He only cares about accommodating her and what she wants. It just brings back all the crappy memories from the past where he’s taken her side and allowed her to disrespect me. We may not be together but I never let anyone disrespect him because as parents we need to have a certain level of respect for each other.