there is a broad class of psychological problems called "personality disorders" and they're basically "spectrum" disorders, there's no one size fits all diagnos

there is a broad class of psychological problems called "personality disorders" and they're basically "spectrum" disorders, there's no one size fits all diagnosis for anybody, and even skilled practitioners go through a tricky and time consuming process of diagnosing patients directly, i.e. we can't diagnose him from here based on 2nd hand information, and especially because we are not skilled practitioners. wrt your "personal theory" (sense of obligation leads to resentment), that's too simplistic, but for the sake of argument, let's say you are on the right track, here's how to improve your understanding of personality disorders: all people feel the resentment of obligations to those close to them. That part is actually the normal part. The question is, why doesn't the person with this disorder (we are hypothesizing) feel the other positive parts of a close relationship that help a better adjusted person feel in balance, and then take the normal resentment of obligations in stride.