AIO, daughters dad will only communicate with me with his girlfriend present or in a group chat with her

My daughters dads will only communicate with my if his girlfriend is present or in a group chat with her in it

Between the first and second message I sent he replied in the ‘group chat’

General background- he has been with her right around a year. We split up 4 years ago, we were together 6 years. Our daughter is 5. He has 2 other children, a 2 year old with someone else and a newborn with this current girl.

We have ALWAYS coparented great. Whether either of us were in a relationship, single, even when we were together we always were great parents and always got along great when it came to parenting(he was unfaithful to me multiple times, which is why the relationship didn’t work out). Always agreed when it came to decisions about our child, how we’re were going to raise her, we would go on family outings on occasions or with a group of mutual friends. We split holidays together and would occasionally spend holidays together still(even if either one of us had a significant other, we would ALL spend the holiday together). Nothinh was ever weird, or awkward, because we cared about each other and just wanted what was best for our child. Always had combined birthdays. If he needed something, I was there, vise versa. I’ve watched his 2 year old multiple times for him, etc etc. you get the picture.

It’s been a slow progression, of him not coming around anymore. We have 50/50 custody. Last year around the holidays, there was no issues. I was single on Valentine’s Day, and it landed on his day so I offered to take our daughter so they could go on a date. Over the summer, I would occasionally ask them to do stuff. Bleach, park, etc. was always a no. Okay, np. Halloween comes around, and we have always done the same thing. Went to his mom’s neighborhood with his brothers and everyone’s kids. He informed me less than a week prior, they were going with his girlfriend’s family. I was upset, tried talking to him about it, we normally communicate well but he was standoffish. Thanksgiving our daughter got passed around, and it was almost an argument that I had to bring her back to his girlfriends family’s house when I was done with my family’s. I had a friends thanksgiving to goto, but I caved in and did what he wanted.

Fast forward to about 2 weeks ago, he created a group chat with me, him and his girlfriend. When I text him privately, he replies in the group chat. Sometimes, he will reply in text. But only during the day if he’s at work. She never says anything in the group chat, just watches our normal conversations about exchanging and school stuff.

Over the last few months, my daughter has been crying about how she wants us all to be together. She’s noticing the shift in everything. And inconveniently, it’s effecting my life as well because holidays are becoming a struggle, and exchanging her is always on the girlfriends time instead of her fathers.

I’m thinking I need to retract our verbal parenting agreement. We never went to court, only filled out paperwork that was never submitted, that he of course lost. For context- he doesn’t have a good relationship with the 2 year olds mother. He’s lived about 8 different places since we’ve split up, she goes to school in my district(I’ve owned my home 8 years).

Am I over reacting? Or is this her being controlling?