I dont get it

You said you really like me
and you were willing to give me time
and i said that we can only be friends
you said i broke your heart
and we didnt talk for a whole week
i thought i lost my best friend
and when i realized that i do like you
it was too late cause you were already with her
and you said if only i could have been a couple days earlier
but if you really liked me then why did you move on so fast?