Friends with benefits?

I've been out of a relationship for about 3 or 4 months and I'm okay I'm starting to learn to be on my own and starting to love myself again but I met a friend and we've known each other a while and he said he wants to be my friends with benefits said he had a crush on me I high school and it's strictly sex my question is is friends with benefits bad I grew up taught to only be with one person 😓 Till I die and I feel like this makes me a bad person for want to explore more sexually I'm also in college