Definetly do not show that you're insecure or jelious or too clingy, be supportive about activities that he wants to do or join...be caring and listen to his problems if he has any..If he's ever having a down day or a hard time just try and give him some space...stay faithful and true to him and try not to lie to him ever....and never leave a problem unresolved always make sure the littlest problem gets resolved or else it'll just build up more&more. And just love him and show him that you care. Always start the day out with a hug and kiss and end the day with the same. If you guys get into a fight try not to yel and just try and talk tings out but if you're really angry give yourself and him some space and when you're ready to talk...talk! And just be you, be the person that he loves and fell in love with to begin with. You never know when or what will happen and you don't want the last minutes hours togather to end in hurtful words. Just love him and remind him of that everyday.