Can some1 explain this to me?

i don't know what to do. my fella has left me after 6 yrs together.first time he was gone 1 month, and now he has gone another month.he goes out every saturday night with mates,a nd says he needs 'sapce' to clear his head.don't think he is seeing anyone yet as he is at home evry other night.however, when i move on he will text and call to meet me.he keeps asking if i am dating anyone yst.if i say i am he freaks out.and then hes says he will be back soon.what is he playing at here?