Tell him, guys arn't good at expressing the whole emotion thing. He might not even realise he's giving mixed signals. People are not mind readers either so speak up, say it all & more. Tell him not only how you feel but also how what he does affects you. Explane how what he's doing appears, draw out of him what he thinks/feels. Relationships are built on comunication, even friendships are, better such things done in person tho. In person there is time for silences calls don't alowe, a letter or email only goes one way. To resolve this is an interactive thing between you two that the monolog of email or letter don't alowe. Work on it if nothing else it will deepen your friendship if lucky might make for a potent love.