Most Helpful Guy
You might truly care for him, but if you care about how he thinks of you.. You'd never message his brother to tell him to read your messages. He's choosing not to respond, that's his choice... There's nothing you can do and he's certainly not going to change his mind because you asked his brother to tell him to read them, that will just turn him away even further. Back off and give him time, he might get over it and hit you up in the future, but right now he clearly wants to be left alone and you've got to respect that.