Anyone, whether in MLC or not, can find their way to victim mentality and blame others for things that happen to them or around them. If desirable for you, validate, either by way of accepting truthful responsibility, or (if you feel the points are untrue) simply by acknowledging those are his feelings.

Regardless of whether the two of you R... without ANY expectations... are you willing to support him in his growth? Like you would ANY friend?

What do you want?

And is it important for you to live up to what you believe are the expectations of friends, family, and other people in your life?

The chances are, this would be a brand new R with someone. If he hasn't or doesn't step up, then perhaps your friends and family have valid concerns. What would a healthy R with your X look like, to you?