I got a divorce in 2021. I'm head of household, and have custody of kids. I received AdvCTC. 6419 says I got half the amount I received. Ex got 6419 with other half.

Ex didn't actually get any of the money, it was direct deposited to my account. Do I enter half amount or full amount? We're filing separately. Also, I think I made too much this year, and will have to pay the amount back.