About bisexuality

My question is that one of my friend recently became bi after a break up with his cousin. the reason he became bi is because of a guy that guy was already gay so he targeted my friend .after two months of my friend's break up he comes in relationship with this guy he wasn't bi he is being manipulated by this guy bcs he was abnormally kind to my friend.they were not even friends they met through mutuals and then after meeting that guy Started becoming close to my friend I've tried thousand times to make him understand and my friend knows that he is wrong and all this thing is Haram but he still wants to do this bcs that guy treat him like a prince unlike my friends parents .so please tell me what should I do I will do his counselling one last time bcs he recently told me he wants future with this guy so tell me Shaikh should I cut him from my life bcs I've done his counselling more than his mother and I don't want to support him in his wrong decision so tell me what I should I do.