"For Gaurav only a girlfriend has right to ask or expect what for Bani a friend can ask."
I don't think it has anything to do with how old is their friendship because in unseen videos whenever Bani tease him by saying that as yet I understand you only 10% or 15% then Gaurav get irritated as he think they've spent enough time together that now there should be no confusion between them.
Maybe he came from that school of thought where 'Ek ladka aur ladki Kabhi dost nahi ban sakte'.
btw if this friendship thing was imposed on him then he would consider Jason as a blessing or relief but that's not the case. He never leave Bani after saying or doing something harsh the way he left Lopa yesterday.