Originally Posted by disillusioned
The girl left without looking back. The guy was trying to be hard with her but you could see how sad he was. Too bad, if they only knew it was coded in their DNA maybe they would have been nicer to each other... not hurt, not angry... they could have told each other "That's life, relationships can't last forever, despite what all those songs on radio say..."
Why would the break up be any less painful even if they knew that (according to you) their relationship was doomed to have an expiry date? Humans come with a whole lot of emotions. When we are intimately involved with someone we let our guards down and we tend to expose to them the things that are most likely to hurt us. Leading up to a break up there tends to be a lot of fighting and a lot of these things are brought up which leads to the break up being painful. There are plenty of non-monogamous people who have break ups that are just as painful (for all you know the couple who you saw were non-monogamous).