Obligation is a bitch.

You know going into a situation that it is going to suck... And you know this because the last time you went into the same situation, it sucked... And the time before that, and the time before that, and so on.

And each time, you go ahead and do whatever you're not wanting to do because you steel yourself and fall back on that tried and true reason that has gotten you through the shit each and every time:

"I have to."

We humans are interesting, if stupid, creatures.