Thanks for the TL.
I get why the MC is still bitter, because he has a point. If they only thought of his well being and that's why they banished him, then why not apologize and convince him in joining their party back to make their dream a reality? Apologizing now is worthless, it's only to appease themselves because they feel guilty, which doesn't do anything to the affected party.
Reasonable crash out, but true that he is also a bit childish.