As presented, the quote implies that an individual has let go of qualities (perhaps preferences, views, opinions, quirks, generally unique characteristics that makes an individual who they are). The individual may have done this out of a desire to evolve as a person, to get ahead, to compete, to fit in, or literally to conform. The speaker, however, does not appreciate or like this new behavior.

For example, if a person once was known for blunt honesty (ex. that shirt is not the right color for your complexion) but now flatters everyone (ex. isn’t that a lovely shirt!), an observer may note that this (or a similar) change has made them like a new person and he or she perhaps misses the old one (or old “you”).