His dreams anit pretty?

i have a boyfriend, who've i've been seeing for the past four years. we have been a couple since we were in highschool. now i' haven't been the perfect girl for him but i have grown up and realized how much this guy means to me. he has loved me from the begining and has never strayed away, through the heartache i've caused. i love him lots, & do practiclly everything i can for him when were together. when were apart we miss eachother alot. i leave for work really early and he get to sleep in and work later on at night. when i get off work he is going into work. so that's really sad we're apart most of the day. but when i leave for work early in the morining i love him (as in giving him xoxo's) and tell him i will call him later and that i love him. now when i'm about to leave he says don't leave i'm going to have a dream... and he's dreams aren't pretty. he dreams that i am off dating other people and messing around on him (just smashing his heart) in his dreams... so i stay just a little bit longer to ure him that hey this is reality and i'm here and loving you. what way or things could i do to help him stop this dreaming situation... i am there for him all the time, i love him sooooooo much when i'm around him, he has to tell me, no don't love me.... get off... but he's jokinly saying that... cause its usually in public but in privite i'm allllll luvly dubby. when he gets these "dreams" he's calling me whereever i am (work) n kinda getting loud and sad asking me if i'm cheating on him... and of course i say no cuase i'm not but then he makes it seem like he wants to break it off when these dreams come to his mind. idk what to do about this... please advise.