AITA for not telling my daughter's dad my boyfriend's name?

I have been divorced from my ex husband for three years now. When we split we agreed that we would tell the other parent if we planned to introduce our child (7-year-old girl) to a new romantic partner. He held up the agreement - he told me about his now-wife when they became serious and also gave me a heads up before he introduced her to our child. I know her full name, address, where she works, where she's from, etc... But since she has been around, my co-parenting relationship with my ex has gotten so much worse, to the point where we don't speak and only communicate on an app. I've never spoken to his wife and that's my choice. I pretend like she doesn't exist.

So because of the deterioration, I no longer believe I should be held to our agreement. I've had a couple of boyfriends and my ex found out about them from our daughter. I've been with my current boyfriend for more than a year now and so far have been able to conceal his name and work from my ex. My daughter and I just moved in with said boyfriend (I am the custodial parent) and I gave my ex the new address, as I am legally required to do, but I still don't want to give him his full name. I did tell him that my boyfriend is a police officer, so that should be comfort enough. My ex says that he should, at the very least, know the first and last name of someone who's living with our daughter most of the time. But again, since our relationship has deteriorated, I don't feel like I should have to tell him anything that's not required by a court order.

My ex is not a dangerous person, so that's not an issue. He's a good dad and pays the max amount of child support allowed by the state. Our relationship has become extremely difficult in the last year, especially, because at first we had a 50/50 split without child support, but then he took our daughter to a pediatrician against my wishes, so I sued him for full custody and child support and won.

I am not legally required to tell him anything other than my new address - that's what the most recent court order says. He says it's the decent thing to do to tell him my boyfriend's name. Why, though?

Am I the asshole?