What should i do :'( ?

My boyfriends 19 and im 18 we both live at my parents house. Hes a postman and gets up at 4:10am everyday to get to work at 6am. He works 6days a week obviously this is making him tired and grumpy. When he gets home from work he sleeps because hes so tired and i barely see him because of this and we live under the same roof. I know he loves me earlier today he was talking about getting my name tattooed on him which i said no to because you never know whats going to happen in the future. Things haven't been right for months he pulls away when im kissing hes neck and says im annoying him and when we sit and cuddle he makes an excuse so we don't have to anymore. Our sex life isn't as good as it used to be either. Sometimes hes fine and we are great together but 85% of them is unaffectionate and i feel unappreciated. I know people are going to say hes probably having an affair but i know 100% that hes not. I have told him how i feel many times he says he sorry and he will change but months later things are still the same there's only so many times i can sit and talk to him about it. I love him but all of this is stressing me out and making me unhappy what should i do :(