My ex asked me to be friends with benefits?

My ex boyfriend asked me to be friends with benefits. i really dont have anymore feelings for him, though there are some lingering in the back of my mind. (lol) but generally, im over him. he asked me this about a week and a half after he broke up with me. any ideas on whats going through his head? i mean, i know what the rules of fwb's are, im just curious as to why he might have asked. does he find me attractive...or slutty...or easy? id like some input :)