Hi Impala

I don't think a "thinking of you" message should carry the expectation of hearing from that person. It's just a statement of how you feel, and you can't dictate the feelings of others. It's completely their choice if they choose to accept your offer of true friendship and respond. If they don't take you up on your offer, at least you know they are aware you think about them on occasion.

People have a right to choose with whom they want to be friends.