It is a name
Means tied together. Playing or singing the notes smoothly as if they were connected.
Probably the fear of being alone. You should know that you are worthy of a good man that deserves and will appreciate you, but also that you don't need to be in a relationship to be complete.
Yes he can, the lease is transferred to the new owner. Just be sure they are aware of the condition of your apartment, or the new owner could get you for damages.