2. He’ll use inside jokes
He will do this all the time. He will tease you while you’re in a group of friends. And the thing is, he will use inside jokes that no one understands except the two of you.
You see, the fact you have something personal, that you share something nobody has any idea about, is a definite sign that he wants to have something more with you and a sign he wants you to be his girlfriend. It is obvious that this guy wants you to be more than just a friend to him, but he is probably too shy to express his feelings directly.