Mainly because, Ahem has not consciously realised that all he has been experiencing with regards to Gopi are his feelings of love, its all in his subconscious. It would hav been better if there was a declaration and conscious realization of love before they reached this step.
I just think that a sweet girl like Gopi deserves to be loved wholeheartedly and not under the influence of bhaang.
just my 2 cents. hope he doesnt revert back to being rude or blames her for intoxicating him. i wont be surprised if the creatives do something like that.