Both thinking that other is busy and will not contact each other,
thinking it might be disturbing to the other party.

As time passes,
both will think
"let the other one contact me first."

After some time, each will think
" Why should i contact first?"

From here onwards,
not wanting to contact each other
the friendship will start to drift apart...
Further and Further.

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

And we forget each other?