What are the mood phrases to express regret?

Sentences expressing regret:

1. I will try to be someone you will regret not cherishing.

2. I once had a sincere love that I didn't cherish. When I lost it, I regretted it. The most painful thing in the world is this.

3. If one day, you begin to regret giving up on me, please remember that I never want to teach you how to cherish by leaving.

4. If I could go back in time, I would choose not to know you, not that I regret it, but that I can't face the ending without you.

5. if you give up, you shouldn't regret it. If you lose it, you shouldn't remember it. Put down what you should put down and quit the drama with no ending.

6. Don't let your past self kidnap your present self. Don't let your present self hate your future self. Don't let the future you regret the present yourself.

7. If I were allowed to live my life again, I would like to repeat my life. Because, I never regret the past and am not afraid of the future.

8. For you, my biggest mistake is falling in love with you, and what makes me regret more than this is that I accidentally lost you.