Yeah, when writers do try to build up their relationship, it's almost always from Diana's point of view. So it amounts to her gushing about how great Bruce is while we get nothing from him. It makes their relationship completely one-sided and, as you said, only serves to build him up.
I know some will say Bruce just keeps his emotions guarded and really does care about her deep down, but it's comes across as hollow and, at worst, makes Diana look like a dope pining over a guy who barely notices her.
Agreed. I don't see Diana, someone who so values truth and trust, would like one of her supposed friends being someone who studies her weaknesses and sees her as a thing.