Why would a guy suddenly break things off with a friend with benefits?

Anonymous
The second to last time I saw my friends with benefits we were having sex in his bed, and then we went out to grab something to eat. Everything was perfectly fine and normal. After we parted ways that day he went radio silent, no texts and no calls. I didn’t hear from him for two weeks until one day we bumped into each other. I’m not sure why but he started talking to me very rudely and broke off our friends with benefits relationship. I am very confused. I’ve done my best to be a good friends with benefits. I respect his space, I’m not clingy, I don’t care if he sleeps with other people and I don’t even ask about his sexual life outside of me. I’ve tried to make it as clear cut and straightforward as possible. In fact, he was the one always crossing boundaries: making me meet his family and other friends, wanting to hold hands and cuddle, making all these grand statements about how he’ll always be there for me. I just don’t get it.
Why would a guy suddenly break things off with a friend with benefits?
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