I have had this experience although with a friend, not a partner
To process what it means....it's a bit of a vague comment so I'd be confused too.
Losing my friend when I got unwell with ptsd was painful, still hurts, but I really think jn a way it tells us who we can count on. I have beautiful friends now, after letting go of those who walked away.
It sounds like it is convenient for him to step back but realistically almost every single person will at so,e ti,e struggle with their mental health, making a choice to close Ur eyes to it, and not want to be there for ppl through it, seems to be shallow.
What would happen if he were to struggle with his mental health?