Itīs a song about that anybody needs his freedom and independence even if live in a relationship.So donīt know whatīs tomorrow happen and donīt have to explain because if you need me I will be there for you.Can give the heart but canīt promise anything.
Itīs a song about somebody who is sad because his lover leaved him and now he have to sleep alone again and miss him.He think about why he canīt just forget about like this person.He wants to "switch in his heart" same.