Thing is, when you read a manga chapter by chapter, a lot of times the pacing can seem slow and frustrating, and the cliffhangers gimmicky, but when you read the same story in a trade in one batch, it flows pretty well. This cliffhanger is kind of BS and I don't expect a solid payoff, but it's also the kind of thing that would just pass uneventfully in a collected trade. That's the consequence you face of reading a story piecemeal. Getting upset about it is just going to stress you out.
I assume either Uta's going to chicken out or get interrupted. Best case scenario is that Kaoru clues in -anyway-, and starts processing what it means on her own.
As for why we haven't gotten the backstory, it hasn't been directly relevant yet. I suspect that at some point, we'll get a major confrontation between Kaoru and Reiichi, or Kaoru and Risako, (or Kaoru and both) and then we'll get a flashback arc that fills in the gaps. I also expect that when this happens, people will gripe endlessly about it, but once it's done and read in quick succession, it'll flow pretty well. ;p
Also, to those who are angry at the fact that Reiichi is cheating with Risako, I'm not going to make excuses for his behavior, I think it's definitely bad, but some things to keep in mind for perspective: He seems to have married Kaoru partly out of pity or guilt of some sort, and he seems at least partly aware of Uta's feelings for Kaoru, and he does honestly seem like he's a caring brother.
He might have a lot of complicated, conflicting feelings about their whole situation, which might make running for comfort into the arms of his ex a pretty tempting retreat from it all. He honestly -doesn't- seem like a cliche jerk, so I wouldn't write off the notion that there might be some more complex characterization there, although he is still definitely being a dumbass jerk right now.
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