Wow Valerie pretty much nailed it, nice list, it strikes me as odd that people jump in the water head first, then complain years later, I mean people should be more careful and understand what they are getting into - basically when you say the last "I DO" it means you are agreeing to the terms of basically everything on the list, people don't read the fine print, they just hook up, fornicate and claim they love one another (biggest BS sham ever) because it's based on lust and infatuation only, which causes people to lose 99% of their brain cells at that very moment and commit to marriage to people they barely know other than the good shag they had the past 3 months before their proposal. People usually take bad decisions or commit to stuff they cannot handle, then they complain AFTER the fact.
Living with someone has its pros and cons, it should in THEORY have more pros though, if a relationship is based on TRUE LOVE, compromise, understand, honesty, communication, ahahahaha what am I saying, what planet am I on, right, I forgot........

If people commit for the wrong reasons, they will hit a wall at some point.
Being with someone comes with a price, it won't always be happiness and everything runs smoothly, it's human nature, we are hard wired like that, God thought it would be boring if every human got along 100% of the time
So yeah if people commit for wrong reasons they will get hit hard with reality, and if people commit based on the initial infatuation and lust, that will fade out quite fast.... TRUE love can be maintained, and both parties can deal through the worst times. Remember the vows, for better or worst, in sickness and in health, I think most people don't pay attention to that part before saying "YES I DO".
So yeah there are cons of living with someone, BUT there are cons of living alone. In an ideal world people want to meet someone LOVE them (TRUE LOVE) commit to them build a family and not die alone like a rat ! Then you have people who WANT to be with someone but get rejected because of looks or other reasons, then you have people who simply can't get along with ANYBODY, this type usually never gets it, even after the 5th divorce
So yeah some people are meant to be alone and die alone - and some people are meant to be with others, in good times and bad times.....
Though I think past a certain age the cons outweigh the pros for being alone.........