What's the word for backstabbing?

1. Ironically, we pretend to be psychologists in front of our friends, but we can't even solve our own problems.

2, everyone will be afraid, especially after desperately cherishing it, but still nothing can be left.

You said you were together, but it was me in the end.

4. The world has abused me thousands of times. I am happy to repay the gratitude to the world. If you stab me in the back, I will give you a indifferent smile. I will say that it doesn't matter, you just missed.

Once the dream is broken, I will pick it up and try to piece it together, then it will be broken, and then I will pick it up and piece it together until one day I can't piece it together again.

6. A friend at night is a day, and an angry friend is a joy, so sometimes it is good to turn your mood around.

7. Always believing that you have me in your heart is the stupidest thing I have ever done.

8. For your future, you should study hard, work hard and work hard. Just to avoid being looked down upon in the future.