Me and my boyfriend are going through hard times.... help plzz?

I've been in a relationship for 3yrs but recently my bf seems to care more about his friends than me.... he does not let me write on his fb wall or have pictures of us on facebook. however he posts pictures of him and his friends... they even have this inside jokes that looks more like flirts than jokes ... he says there is nothing between them n he can even introduce me to them .... I've become very sensitive and jealous and i think this is affecting our relationship ... it seems like i don't have any control over things.i need help, i really love him and i don't want to end this relationship but i don't think talking will work either. what should i do ??