Why does he try and controll me when he should know he wont?

Im dating this guy and hes controlling, he tells me to wear shirts that go over my butt all the time unless there sweat pants or not to tight cause my butts pretty big an a lot of guys use to like me because supposibly I was called barbie with an a** an thats makes him so jealous but he doesnt care if I do my hair or makeup though he looks threw my phone sometimes an always asks me did anything happen that day that he wasnt with me an I have to swear but he believes me its not really always an argue ment but weve been together for about a year he wants to know were I go an stuff all the time which is really dumb but I always laugh at him when he gets this way an I fight an arguement with him untill he sees im gonna do what I want an then starts getting use to it, but ssomtimes I just let him do whatever but I fight back I d ont sit there an let him boss me around, but other than that hes good to me gives me money when he has it gets his mom to buy food I like at there house we talk about everything an were like bestfriends/boyfriendgirlfriend cause he doesnt have his friends anymore really an I dont have mine really but I have some still I make time for so thats gotta count for somthing but he spends all his time with me thats why I dont think his friends are there anymore really but what can I do to make our relationship better?