Does your friend have the right to taunt you and attribute the cause of your affliction to your lack of piety, and should you abandon him?

Your friend is abusive by taunting you, and this is not the characteristic of the people of faith. If he is good, do not abandon him; rather, advise him kindly in light of the fatwas mentioned. You must repent from the forbidden masturbation, and your disclosure of practicing it to your friend is another sin that necessitates repentance.