Tell him what you like about him, remind him how important he is too you.
Tell him things you like about him...he is a person who is of good character....he is smart....he is nice...he is cute or nice looking....a good athlete...tell him something he is good at...you like his eyes or his smile. Not sure if these are important in today's world, but it is what we would tell our bf's in my day. Hope this helps or at least gives you inspiration to come up w/your own list.
grab him. hug him so tight and tell him that you love him.
I would recommend developing a compliment based on his strengths.
if you wanna **** him off, say Putz...