अक्सर..

मेरा होना है

तुम्हारी हँसी की रौशनी,

तुम्हारा न होना

मेरे अँधेरे की उदासी;

मेरा अँधेरा तुम्हारी रौशनी को

ढँक लेता है अक्सर.

Your mirth is a light caused by my presence (in your life)
Your absence (in my life) is my darkest gloom
(your) light is often overpowered by (my) darkness...

(The happy moments are mostly shadowed by sad ones)