Da best friend

1: The term for a man who confessed his feelings to a girl but rejected later by the phone or mail. However the girl wants to keep the relationship(Not include physical contact) with him for the sake of her life plan.
2: A man which girls may want to have him as her boyfriend but not as first choice probably second choice or third choice =back up boy

Girl1:Thank you you are da best friend.
You:(Fuck..)

Girl2:Let's be da friend.
You:(Dam..)