..because you are unclear of where things stand.
Engaging in an undefined friendship is confusing because you do not know what you mean to the person, if anything at all. If the person cannot make you feel as though you are significant, reflect on why you are allowing someone to treat you this way.
Be in the company of someone who is proud to have you in his life and will make that known to you and the rest of the world. Be in the company of someone who will not gamble with your heart and mind simply because he knows you are not going anywhere.