kevin's power here is almost scary.
The problem lies in the fact that the cuddle bitches are actually almost always smitten with their friend and would like nothing more than to step in for her BF, and they're sort of biding their time to do just that. But the girls don't view them that way at all and they're often delusional about the CB's motivations, which should be fairly obvious - and usually are to other guys, hence OP's BF's discomfort with Dan. He may know Dan doesn't stand a chance, but it's still never a good feeling for a guy to know that there's some other dude hanging around who wants in his GF's pants..
T/F - thinker/feeler (Thinkers are ruled by logic, feelers by emotion).