Everything is relative,

Depths cannot be known unless they're plumbed.
So while a friendship may be deep,
Who can say if it'll get all screwed up,
The second you think it's love?

Patterns may be persuasive,
Past, present and future much the same,
But though it's happened more than once,
It doesn't mean it'll happen again.

However, you may ask yourself,
Should a point come where enough's enough?
Maybe you just aren't meant to have some things,
Perhaps it's time to just give up?

But then how do you learn, unless you ask?
For what may be, the question posed.
Yet what if all you've learnt so far,
Is that it's often better left unknown?