He said he was never giving up on us, but...

My ex left in 2016. I found out shortly after that he was already talking to the other woman while he was still living in my house. He was with her until March 2017 when he had met another woman in February 2017 and married her in April. They were separated the end of May 2017. 🙄 Anyway he told me that he honestly wanted to change and he was never giving up on us ever. (At that time we had became friends again) June 2018 he met girl 3 and said goodbye again to me. (Girl 3 that I know of) January of this year he reappears and says that hes still never giving up on us. 3 weeks ago he stops texting again. He finally sends a text saying that he met someone online and that they are dating, but its only been a week. Well...that's girl 4 that I know of so he can GIVE UP ON US because I MADE THE DECISION that there will NEVER be an "us" again.