Some of us have been blessed with that one standout friend who you know will still be a huge part of your life when you grow older. You two have an unbreakable bond that's withstood its fair share of hardships, and partners who've come and gone have always felt the need to compete. If you have someone in mind who fits this description exactly, know that friends like these aren't easy to come by. Never take him or her for granted, not even for one second, because not everyone has the privilege to have an incredible lifelong companion. Chances are that you probably know who this person is, but in case you need more hints, here's 13 signs he or she is your ride-or-die: