Have you ever felt as though the person you thought you knew is no longer that same person?
Though it may be disheartening, we must all remember that we all start as strangers. The saying of "nobody knows you better than yourself" holds insurmountable truth. The thing to remember is we must not be afraid of change but rather embrace it. The universe is subject to change and we are part of it. This is an unwritten rule that we cannot change but only adapt to.
So if we cannot help but change, then change to help and welcome it. :)