Confused about ex's post-breakup behavior

Ill try to be as brief as possible.
I was in a long distance relationship for 2 years.
3 months before the breakup, my ex would hangout with some old friends. He was also introduced to one of his friends' cousin, a girl who he told me he liked while we were still dating, but that he saw her as a friend only. For 3 months he would show constant red flags, one of them was him neglecting me more and more. I would complain about these, and he would tell me that nothing is wrong and that i was ruining our relationship with my concerns.

The situation worsened and i told him that we needed a week break. He said he would think of any solution to our problems during that week, but he didnt want to break up with me.
After a week... He told me that he had indeed changed his behavior towards me and that he had lost interest. He still loved me as a person and wanted us to stay friends. I told him i needed time and he respected my decision. I logged off all social media.

Turns out he lied. He was emotionally cheating on me with that girl. They are getting even closer now that she broke up with her boyfriend a few days ago. I wouldn't be surprised if they are already dating.

What confuses me is his behavior after the breakup:

In November:
-He private called me a few days after breaking up with me
-Days later, he reached out to my brother telling him not to tell me that he messaged him, because he didnt want to upset me further (my brother didnt listen to him apparently). He asked about me and my brother told him that Im fine...sad, but fine. He told my brother that he loved me and wanted me in his life as a friend. He would wait for me till I get better and contact him, so that we speak daily.

In December:
-He private called me a day before my birthday
-He private called me on my birthday. I answered the phone but noone was talking.
-My brother showed me from his phone that he had started reading the messages of our group chat on messenger. He had stopped reading them since the day that he started hanging out with his friends and her.

In january, 2 days ago:
-He reached out to my brother again, this time via a different platform, asking about me and basically telling him the same things he told him when he first reached out, adding that im "the most beautiful, sweetest and smartest girl he has ever met" and that he "will wait for me till im ready to talk to him again as friends".
Same day and same hour I anonymously checked that girls story on insta and showed him with her "having fun".

I dont know what to think! He utterly confuses me. I know as a fact that he left me for her, but he had already got his answer that i was still alive, what does he want now?
Anybody with a similar experience or someone who can analyze him?
He got his girl there and his buddies, why is he still concerned about me?
Thanks in advance.

PS. My goal is to not take him back, because I cannot wait for him. My goal is to move on with my life, but he makes it hard.