The reason why most relationships don't last long is that because most couples are just lovers but they're not friends. That the relationship they got engaged in was based only on physical attraction, lust if you want to be brutal. It's like they rushed into a relationship with only their physical admiration for each other not knowing everything that makes a relationship going. So when the physical attraction wore off, nothing hold them back together and the tendency is for them to break up. So just like everyone else is saying, it is better if a couple was not just lovers, but friends as well. So while looking for that someone you wanna give your heart with, you'll not just going to find a girlfriend/boyfriend in their being, you're also looking for a best friend. It's not just about hitting two birds in one stone, it's your heart and your happiness that's at stake here.