How do I say goodbye

It's funny we never realise

How strong humans are,

'Til you've been handed your heart back

Broken

It's amazing how

We can still go on

Functioning

When the insides are

A screaming mass of pain

Of regret

Everything else is a shimmering 

Mirage

The sun's still shining?

People are laughing?

And loving?

But the pain is huge
But no one sees

The raging monster

That

Even the tears find it hard to

Squeeze past 

How are you still alive?

How do I say goodbye?