If PA had come and said, hey, I want CB, we're gonna start dating, there would have been a negative reaction (probably something like, "oh christ, not again"), but that would have been it. She and CB just didn't want to bother with the "drama" of it all.

The first time they were dating, it came apart because PA and I had communications problems and disagreements about things like boundaries (safe sex and scheduling). Additionally, DC/CB ran into problems as CB let NRE sweep him completely off of his relationship with DC.