It's peculiar. Some people sometimes kind of resent those that saw their weakness, responded to it and helped them.

Misplaced pride? Or lack of self-awareness and acceptation of their shortcomings? Guilt that builds upon itself (where just talking about it first could ... just clear things up)?

Or they don't know/understand/weren't explained how to repay it (even if that's as simple as just paying back, or only saying "thanks"). Social rituals definitely help here.