Friends with benefits... good idea?

This guy has liked me since high school, so a good 4-5 years now. We never went out, he did ask me but I refused because I really don't want a relationship with anyone. I still don't. The other day he asked me how I would feel about being a friend with benefits. To be honest I'm not sure it's a good idea because of his feelings for me. I'd feel guilty doing it, even though he was the one who suggested it. Anyone else been through this? Did it work out? Btw I'm female.

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