Life's like a dream

"原来这都是曲终人散的寂寞，我还想等你什么.
你紧紧拉住我的手，又放开让我走
这一次我们彻底分手...."

Why our life just like the movie...
is just a short while for living at this world...
But we have many irritation in our mind.
Don't understand why and no reason why...
it's hard to explain ...

As the old fork's say
"life's like a dreams"
but i still doesn't understand
what is that sentence mean...
maybe i still can't found the answer...

Hope this question can let me know what does it mean...