Everyone has an opinion about other relationships: whether they should go out or ghost, stay together or break up, get married or divorce, etc. Sure, it's nobody's business except for the people in the actual relationship itself, but also that's no fun! It's entertaining to unpack what makes certain couples work and what seem to be clear signs that these two people are going to crash and burn, so to speak. Obviously, some red flags are incredibly obvious from the start, whereas slowly reveal th…