Friendship

Friendship.
How does it break?

Both friends will think the other is busy and will not contact each other thinking it might be disturbing to the other party. As time passes, both friends will think 'let the other one contact me first..'

After some time, each will think 'why should i contact first?'

From here onwards, your friendship will be converted to being stranger.

Finally, the memory becomes weak due to the lack of contact.

And we forget each other.