Relationship?How u trust it? Can be WHOLE life?

Relationship....
U trust it ?
He will love u and forgive and trust u whole life?
I'm really do not know the actual answer
You got != happy
You did not got != happy
It's true...?
Really confuse....
sometimes you will feel sweet coz of him
but sometimes u will feel sad coz of him
Which is the actual answer
Really can't get the corrext answer
Just depend you n him how to treat each other
True?