I think this song is interpreting the point of view of someone who is in a relationship that they thought was perfect but it had changed, 'one day its here and then its gone' represents how the person love for the other was once there, but is no longer and they need to face. The person is too afraid to end things because of what it used to be. It is trying to say you don't need to feel alone and that they they don't need to feel shy to get any help because they shouldn't waste time being with the person they aren't meant to be with.
I think this song is interpreting the point of view of someone who is in a relationship that they thought was perfect but it had changed, 'one day its here and then its gone' represents how the person love for the other was once there, but is no longer and they need to face. The person is too afraid to end things because of what it used to be. It is trying to say you don't need to feel alone and that they they don't need to feel shy to get any help because they shouldn't waste time being with the person they aren't meant to be with.