My guyfriend is mad at me? idk, what to do, help?

today, in cl, i thought it would be funny to get back at him for last time when he took my candy & ate it. so, i got lipgloss & wiped some on his shirt. it was brand new, & he got mad. i told him that it would come off in the wash, but, he said it wouldn't because it was a flannel. what should i do? i know this is stupid, but, still, i really don't want him mad at me? so, help! :(