is it mean of me to say that hes a slut?

nope or else most of us ae mean thinking the same =P

so...you don't enjoy kissing or having sex? or you are "slut" also?

It's not his fault it's like his been hypnotise and there's a word to trigger it so it's not nice to call him a slut （￣へ￣）

I agree with this one. I also thought that he was being hypnotized so i don’t get it why people call him slut. It’s too mean to call him that..