own difficulties. What happened was wrong, but he doesn't need to change. He doesn't need to apologize.
As long as you’re expecting the other person to change, that’s emotional dependency, when we should be seeking emotional independence or in other words captivity verses agency.
You have to find that peace within yourself. If you are so dependent upon that person whether to apologize or not, then that takes away your agency and puts the burden of your happiness them.
Let it go!