Is it normal to be all good only when you are with a certain person ?

Is it normal to be happy , thin , young , alive ONLY with a certain person?, it's like this person doesn't want you to be all that unless you are with her?, when you don't see that person for a couple of years it's like you get worse, you get fatter , older , not lively , not happy .Could it be that you are an inverted narcisisst that only like to be with narcisissts ?