Why does he keep his options open?
If youre taking things slow then hes still focused on you. Keeping his options open means that youre just one of many possibilities in his life. He might not want to jump into a relationship, but if youre really the girl he wants, a relationship is exactly where you should be headed.
How do you know when a guy is stringing you along?
Hes genuinely looking forward to seeing whats in store for the two of you, and he isnt afraid to admit it. The guy whos stringing you along will move onto the next subject whenever anything about the future comes up. Hes a master at dodging the bullet, and you can never count on definite plans with him.