I dont know what to do anymore?

please don't let the length of this frighten you. i really am trying.. i have this boyfriend. we've been together for almost a year now. around july 10th he moved to texas with his family. i stayed in california with mine. while we were together in cali i introduced him to my whole family. and a cousin a year older than me. he told me that he would never let this relationship go. and that he promised to marry me when we are of age. its been almost a month since we have seen each other. but we talk and text very often. but as of today i am now aware of him and my cousin talking almost as much as we talk. i confronted her in a calm an casual way. and she said yes, A LOT. and now i know that he has been sending pictures of himself to her. he makes conceded jokes about them but she replies as but really you are cute or yes it is. in a serious matter. he told me this today. he said that he sent her a picture and she said but really it is cute. but he had no idea how to respond to it. so he didn't. i think that he may fall for my dear cousin.. but that's the least of my problems. it seems as if his parents don't want us to be together. they put restrictions on his phone so that we cant talk as long. i am now in HI while hes in TX. 5 hour difference. he has a different phone company then me.. and every week the restriction seem to cole earlier.. he gives me so much heartache.. and i don't know what to do.. i really love him. but i don't want a long distance relationship. the latest he can see me is in 5 years.. but can visit some if my mother will let him. i feel as if he might give up and cheat on me.. but i don't know. you don't have to answer. just felt like talking to someone. and this is the closest thing to "someone" thanks for your time.