Stop waiting for him to 'prove' something to you by making the move. Maybe he wants your interest 'proven' by making the first move towards him. If you're both waiting for the other to go first, it's never going to get anywhere. Remember, you left him, why would he be the one to initiate the reunion? When you walked away, it was meant for him not to follow. You need to do the walking back and sharing all your feelings and concerns to him if you wanna see this go anywhere.