The idea of being 'just friends' after breaking up is gaining momentum and people actually finding it a better way to deal with the pain a relationship break cause. There are things that make a person being in touch with their ex. what are those?
A true friend
Your relationship might doesn't work or you are not meant for each other but no one can deny that being in a relation you both understand each other very well. A friend of yours might fail to understand you but the person with whom you were in a relationship know you inside out and that's how exactly true friends are.
An open-ended option
Sounds selfish but it's actually a reason. Today's ex was a couple some time back. They are more open to each other, don't hesitate from each other and most important why they would look for other when they have an option open.
Curiosity
The mother of all the reason why ex chooses to be in touch with each other. One is always excited to know whereabouts of the other. It keeps them connected. Well, the social media provides pretty much option to a person to keep the other aware of your life.
Attachment
They have spent much time together and the feelings and the emotions will not fade away easily. Relations can be easily broke up with the words but breaking a relation from the heart is not that easy. It's the attachment for each other which keeps the ex-couples together.