
I guess I’m in the minority in this, but if you made clear you don’t have feelings for him and he still wants a fwb relationship with you, then that’s his choice. It’d be analogous to like if you friend-zoned someone. If someone were to ask you out and you said in response that you weren’t into him like that, but both of you agreed to remain platonic friends, that’s not leading him on. Neither is it stringing him along when benefits are involved either, imo.
I agree with #1. I get it, you made your thoughts/intentions clear, so it IS his choice to keep doing it….. but if you KNOW it’s hurting the person, why on earth would you keep doing it? If you care about them, you’d just find someone else that wants what you want. You are 100% using him.