How can I tell him that I love him?
By opening up your dang ol' mouth and projecting words.
go up to him and say hey I LOVE YOU
You can go straight to the point and tell him or buy one of those big cookies that say I love you and give it to him. If he asks you, tell him you got it because you were thinking of him and that's how you feel about him.
I LOVE YOU. Boys understand better when you say what you mean.