Why would a guy constantly accuse you of talking to other guys?

Anonymous
Basically I am in a friends with benefits relationship with a good friend of mine for a year now. I find it really odd that he accuses me of talking to other guys and possibly having a boyfriend when he has said he doesn't want a relationship but he cares for me. Even though he makes it a point to call me his lover, friend and I am the only one he's been with. He is very affectionate and caring towards me (massages and kisses all over). The truth is I am not dating anyone because I don't feel like guys appreciate good girls like me so I don't bother. We can not have a normal conversation without him saying he knows I have someone else. When I ask him if he has proof of his claims he says no, "I just know you're doing it, because you are a woman and its nature plus I don't care if you do". He says I don't tell him what I do when I am not around him but I honestly don't feel like I have to. I don't question him on what he does, just ask how was his day. If I am on the phone he tries to piece together what I am talking about. I feel like his words are contradicting with his actions. Can anyone give me clues to why he migt be behaving like this?
Why would a guy constantly accuse you of talking to other guys?
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