What do i do when your in a long distance relationship and your boyfriend lies to you?

My boyfriend and i have been going out for almost 3 years. I moved to another state after being in a relationhip with him for a year. Everything was going great intil are 2 years came along. I found out that hed been smoking weed behind my back since i first met him. He told me that when he is around me he feels like the person he wants to be and he promised never to do it again. He also said i could randomly drug test him. Hes been clean since.. We went on a break for like 3 months and it turns out that he had hooked up ( Only kissed)with another girl for like two weeks straight. When i told him when i hooked up with someone he wnet off on me saying i didnt love him and everything. N then i found out by tricking him he hooked up with this girl... it not like he told me i had to trick him into telling me what happened. He told me they only kissed once. Turns out he lied and they been hooking up for two weeks. I dont care that he hooked up with girl cuz we were on break but i care that he kept leing bout it. Also he lied about the weed smoking i found out by one of his best friends... I was complately devasted that he would lie. N now again i find him lieing about something so stupid. He said he didnt wnat to get me mad( His ex gf went to a family party.. His fmaily and her family really close) but then he didnt wnat me finding out by something else. he said he felt guilty so he told me. I got rele upset because i asked him straight up that night at the party if that girl was gunna be there n he said no.. He lied to me... I honestly dont know what to do any more. i told him never to lie to me again n he promised he wouldnt and he did it again... Honestly he doesnt want me to get mad and i understand that but i kept telling him that if he is honest i wont be mad ill be annoyed but thats it. Being in a long distance relationship is really hard but i love him soo much... I dont want to break up but i dont know how to deal with this anymore. He also says i control him to much cuz i dont like him going out to do ****. But its cuz i dont trust him. So the other night i said fine he could go out and do w.e he wants as long as he doenst go to a club without me. I move back in 5 months so i know itll be better but idk what to do know. How do i trust my boyfriend to go out with his friends and having other girls around? How do i know hes not going to lie behind my back about osmething? He keeps telling me that he would enevr cheat on me and that he loves me with all his heart and doenst wnat to loose me but he doenst wnat me mad. What do i do?