How long is too long for a friends with benefits relationship?

I’ve been in a friends with benefits relationship with the same guy for 6 years now. We’ve been on and off but we always end up going back to each other. Whenever I start dating or get into a relationship I break things off with my friends with benefits but once that relationship is over my friends with benefits is there to pick up the pieces. He hasn’t dated any girl in the 6 years I’ve known him. He even asked if I could keep seeing him when I’m in a serious relationship. Have we grown too dependent on each other? Is it a mistake that I go back to him after every breakup?

How long is too long for a friends with benefits relationship?
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