What sentences describe how difficult it is to meet?

The sentences that describe unsatisfying are:

1, smelling snow through the window, so far away.

2, true feelings are hard to meet for a long time, and meeting in dreams is always fate. I hate less after a thousand cups, and I don't feel awake.

3, the crowd looked for him for thousands of Baidu, and suddenly looked back, but the man was there, and the lights were dim.

4. Since we can't be together, why should life arrange to meet?

If we meet but can't be together, I'd rather we never met.

6. It's a pity that we can only be friends when we meet.

I hope that when you say goodbye, it doesn't mean that you will never see it again.

When you were leaving, I found that I really fell in love with you.