I think he thinks there is something better out there and doesn't want to put in the hard work. I think his single life got detoured when Covid hit and he got scared when you were talking with the other guy that his plan B was in jeopardy.
That's why you can not show your insecurities. For reconciliation to be possible you need to be on even playing fields. For a relationship to truly work you have to be willing to walk if your needs are not being met. He has to be on trial now too. The problem with most relationships are that both or one persons needs are not being met. You are willing to sacrifice all your needs because you are afraid to lose him. It can't be that way or you will eventually become very resentful.
