I've done the couple thing, and I've done the alone thing, I've even done the alone thing while part of a couple ( lol) and there are pro's and con's. I think it all depends on the other half of the couple, financial stability, two incomes are a pro, another person spending your hard earned cash, a con. Companionship, if you like each other, a pro, if they disappear down the pub or into a video game every night, a con.
I will say that there are some advantages to living alone that most people don't think of,
If you want to ignore the sensible dinner waiting in the fridge and eat ice cream and strawberries, you can
If you want to sit in the bath until it's cold with a book and a glass of wine, you can and finally,
If you want to put on a crappy album and dance naked, YOU CAN !
It's all about choices, only you can make them, and only you can decide you have the RIGHT to make them