I won't argue on your other points because that seems to be your own opinion on the trope
but when did the protagonist show a bad attitude? From what I'm reading, he's been nothing but courteous to her but just wants to do a little more after he realizes his feelings. But all he's been is nice, sincere, and most importantly, respect her boundaries and encouraging (which is something she needs after having such an emotionally abusive bf that takes advantage of it)