If you like him, but can't talk to him - the whole thing is probably a bad idea. Communication is the most important part of any relationship. If you can't be open and honest with your partner, the relationship doesn't stand much of a chance.
you hint it to them very slowly across time
get one of your friends to do it or try to make him say it to u
You shouldn't be saying I love you in sixth grade, but if you want to tell your boyfriend it without actually saying it, then write him a note.
I recommend knocking him unconscious so he doesn't know what you're saying to him
Send her a funny card with a little note.
text or flirt.
simply ask a friend to tell her or send her an email
Be nice to him by doing random acts of kindness for him.
Spend time with her. Listen to what she says. Be interested.
write them a note
Ask one of your friends to go do it for you.
Here's an idea: Why not cut the bull-sugar and tell him "I miss you"?