Why would a guy turn down friends with benefits?

so i had been hanging out with this co worker
he would always call me to come over to his apartment
since day #! he made it clear that was not looking for a girlfriend and only liked me as a friend. As times started going on we started hugging, slow dancing without music, cuddling, and even grocery shopping and cooking for me. One night we were cuddling way to close and i sucked his neck, he told me that was his turn on point. So, i made a hicky on his neck and he touched my butt so i slightly slapped him and told him not to do it again. we laughed a lot that day. Next week, i went to his house after work because i didn't want to go home after a fight with my parents. He said i could sleep on his sofa but he would not move out of the sofa so that i could sleep, so i went to his bed and he went behind me. He said he was sleeping on his bed and started to get naked. One thing led to another we kissed and messed around, he wanted to have sex i told him i could not have sex lol... we had a great time and he told me he enjoyed it, But he also told me that he liked me as a friend, that was really hurt from his last relationship, that he enjoyed very much every time we got together, but he did not want to be sexual all the time, If the sexual thing happen once in a while it was fine. He finds me attractive but only as a friend that he did not know if maybe in the future he would want a relationships with me... who knows maybe.

Ever since he has been acting distant at work. so started ignoring him too. But he will stare from far specially when i walk in front of him, but he doesn't talk me.

What is going on?
i do not understand this guy!!!
i am trying to act normal, and i wish he understood that i am perfectly fine with what happened
Why would a guy turn down friends with benefits?
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