From what you described, I think you have doubt on him. You don’t really think he loves you enough or put equal effort to the relationship. Otherwise you wouldn’t say you can find someone loves you and respects you during argument.

It means that you don’t trust him. Maybe he did fail you or your insecurity was making up stories.

If you can think of something he did contributing your mistrust, then you were not doing it absolutely wrong.

And from what he did after breakup, he doesn’t seem like a good partner material.

You are better off without him. Sorry that you’re still suffering from the breakup. The pain, it too shall pass.