Here's some food for thought:
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Perhaps you don't think a guy is being a jerk when he screws a woman who accepts that she can't really have him. Perhaps you think that it is OK to regularly leave someone thinking, "What the hell am I thinking?"
If you think that, then we can simplify this conversation a lot. Andrew, stop using the word "jerk" so freely. Bionerd thinks it means something different than you do.
If you don't think that, then at least one jerk out there seems to be able to take you out for a spin whenever he wants. And I'm willing to bet that you're not the only woman he does that with.
Ben