why do people deliberately hurt you?

they don't

or if they did 

i didn't notice. haha

Different reasons.
1. They may be retaliating if you hurt them first and deeply.
2. They may lose control of their emotions. Some people have anger issues. They need anger management.
3. Sociopaths don't have compassion, so they don't feel what you feel. They don't understand why would be hurt in the first place.
4. There may be more reasons.

It's up to you to stay away from those who hurt you.  Boo hoo hooing will not help your situation, whatever it is. 

Because they are just mean and hateful.

it's because you don't even know it.

Correct.  But whatever it is whining will not resolve anything.  You are just looking for attention.   Take charge of  your life.  That's what adults do.

if you have suffered as people do, you won't even comment.

Except your little dog, who you treat so mean.  That video broke my heart

and brought tears to my eyes.  How anyone can push away such a sweet

animal, who just wants some attention, is beyond me.

Because they are sick and mean like you are to the yorkie, your a wise ass. 

what are you talking about?

That's your problem right there kid.
You want people to love you, but nobody does.

cause theyre mean