Maybe he didn't forget me, didn't want to wait too long, and wanted to seize the time we can be together now. He should be chasing a girl, but he lacks self-confidence, so he feels it. I think it's a secret love.
3. How many things are always so urgent; The sun and the moon cycle, and time is pressing. It's too long to wait for ten thousand years to win. We should seize the time and strive for the initiative.
4. Ten thousand years is too long. Seize the day means waiting too long for victory in 10 thousand years. We should seize the opportunity and take the initiative.
5. It shows that he is a hedonist, paying attention to the present and not looking at the future.
Maybe the future of him and his lover is hard to say, so he should cherish the present and work hard.
7. Maybe what he means is that people don't need to live 1 10,000 years and can't see things too long ago, but they can cherish and make good use of their existing lives and work hard.