Just the way it was handled and presented to the reader was just too weird and bad for both characters. Paige got her personality surgically removed and Warren was just so smug and unWarrenlike that even without the age issues it would've been bad.
Mostly, I just like it when Warren is single so he can be charming and flirty with everyone, and also when Paige is Paige and not a Generic Blonde Girl.
And even if she was 19, Warren was in his early 30s at this point. STILL SQUICKY.