i broke my ex (avoidant) trust by setting boundaries. i fear they won't come back. what do i do?

and i'm heartbroken about it.

he says he doesn't wanna break up with me but still can't trust me enough to know i won't defend my boundaries as much next time.

my own boundaries don't mean shit right now to me. i miss them and love them and think that i can help them but that isn't enough apparently.