What is heartbreaking?

What is heartbreaking?
Loving someone who doesn't loves you back? or. . .
Imagine this,
Your madly in love. That person doesn't know, That you think about her all the day and that your mind is constantly whispering her name. Everytime you see her you are the happiest yet saddest person on the planet. Finally you decide to tell her, And when you tell her your feelings. You get turned down, By the reason that your a girl.
While you know your not.
Your just trapped in this stupid female body.
Now everytime you see her you can't think straight, Your head gets insane.
Everytime you see her you have the feeling you can't do anything without being "a girl".
Everytime you see her you get terrible gender dysphoria. You're so afraid of people seeing it, So you hide it.
You push it down. Your dysphoria get's worse. You have to do something about it. You know that.
But instead of doing the right thing, You do everything that's bad for you yet it feels so good. you cut yourself, drink, smoke, do drugs and go to bed with everyone you meet at a bar.
Your starting to feel better. Than all of the sudden, She stands there. She saw you smoke a joint.
She breaks out in tears.
That's the moment you realise you hurt the one you madly love.

That's Heartbreaking