write a note saying I love you baby or whatever you call him and put it in his back pocket or jacket pocket so he finds it later, thats what i do C= He said it makes his day just do cute things and say I love you and kiss him, borrow his hoodie and give it back smelling good buy him something he wants, spend the day together Stick up for him
When around your boyfriend, always pay attention to what he says, no matter how boring, because men love girls who listen to them. Cuddle with him and take some interest in his friends as well. Trust him in every manner when he has earned it and have serious conversation with him. Talk about your future together and maybe how your kids will look like.
You shouldn't have to prove him anything. If he doubts your love for him, then he has issues. Try to show him affection though, not too much affection, but to the point where he feels like he's appealing and wanted.