Help me

Hello, ❤ so I have a boyfriend and he is the same age as me we go to the same school and we hang out at school every day we hold hands sometimes we have never kissed when he is sad he won't talk to me about it which makes me sad but yeah. I wanna make sure he is happy uh I love him a lot and confess that to him but I don't know if he does? When I say love you he said ok when I try to talk to him when he is sad he gets mad and tells me to leave him alone what do I do?🤔🥺 PLEASE HELP ME