Wow, just realized that I didn't help you much with that last post... whoops.

I guess I'll give you an example of my thought process in a particularly uncomfortable interpersonal decision:
So, one of my friends (who was the only "best friend" I ever had; we were besties for our entire lives up until this point) decided to quit being my friend about four years ago, for no reason that I could figure out at the time. (I learned later that her father was suicidal, and that she was in a fragile emotional state because of that. It was no fault of mine.) So, to cut off the friendship for good, she wrote me a series of emails that were so scathing and horrible that I actually cried. I had to be around her every day, and every day she would pretend like I wasn't there. The group that I spent the most time with were all friends with her still, and failed to comprehend the meanness of what she had done. It was frustrating.
So, my thought process:
Sensible Me: I can't do this anymore. It just doesn't work. Something needs to get done.
Frustrated Me: But there's nothing I can do! The only way this'll make sense is if she apologizes.
SM: Well, I've been waiting for her to apologize for months now, and I don't think it's going to happen.
FM: So, the other option is... that I apologize instead? But I didn't do anything wrong!! This isn't even remotely fair! It's dishonest! RRGH!
SM: Well, too bad. At this point, it hardly matters HOW this gets solved, as long as it IS solved. This has gone on too long!
FM: ...Dammit! This sucks! But I'll do it. It really DOES need to be done.
So... I apologized. We were never really friends again after that, but at least we were on speaking terms.
Dunno if that's a good example or not, but it's pretty much exactly what I was thinking at the time.