Why did my ex husband move on so fast?

Me and my ex husband been together for 10 years. Married 5 and have a kid. He was treating me like shit and then divorced me. (Finalized in February and we slit last December) We had sex a few times after (most recent was 2 weeeks ago) and I stil love the man even though he was an ass to me and cheated emotionally, lied and has abused me in the past in fighting. I was blowing up his phone yesteday because I still have feelings esp after we slept together again. He got mad and told me to leave him alone because he moved on to someone else and he had good intentions with them and wanted a future. But wtf we just had sex 2 weeks ago and he claims he just met her within that time frame after Sex and that sex meant nothing but a quick fuck. I’m heartbroken and don’t know what to do. I feel like he was rubbing it in but he said he told me because he wanted me to know he was completely detached and no hope for us to ever work out. And I shouldn’t even want us to work but I feel like he’s trying so hard to be a better man to this woman but couldn’t for me. I told him if she knew we slept together 2 weeks ago she wouldn’t want to talk to you and he said he didn’t want to start there relationship on lies and would tell her but ik he wouldn’t tell her he’s lying

Why did my ex husband move on so fast?
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