Neglected NaNo

I want to write.

I have part of a story done — my NaNo from last November.. I need to do some character studies and some research and figure out what happens next.

Thing is, this is the second time in a few months that I've read my story, to get a feel for where I'm at... and still didn't know what happens next. I can't get excited about doing research on undead myths of various cultures, and I can't get excited about writing background pieces, although both are very necessary at this point.

Maybe this is my social inadequacy coming into play. I don't know what happens next in this scenario:
- man falls in love with woman
- man does (non-sexual) favor for woman
- man gets no love (so to speak) but stays faithful
- woman hears gossip that man is sleeping around
- woman gets pissed and sleeps with the gossiper, despite not having made her feelings known to the man
- man goes to see woman and gets an earful
- man walks out on woman mid-rant
- man refuses to do favors for woman any more, despite being in love with her

...And then? Who's zoomin' who?

Wait. This is my story. Am I not supposed to know what happens next? WTF?

It has a happy ending. I know how it ends. I just don't know how to get there. The supernatural bits I can deal with. It's the interpersonal bits I have a problem with.

Any ideas?

P.S. - It also sucks that I have these characters brewing in my head as anime/manga characters... and I CAN'T DRAW MANGA OMG. But how I want to. My heroine would look like Haruhi in makeup and goth clothes, and my protagonist would be a tall, lanky, pale-skinned bishonen type with narrow, evil-looking eyes.

What's also funny? The setting of the story in my head is Bowling Green, even though I don't mention it in the text.