Nothing happens twice.
Once you've missed your chance,
There's nothing you could do about it.
You can try hard and make it work again, but timing isn't always going to work with you.

A tad too early, a tad too late;
Never the right time.
You need the perfect momentum, and once you feel it, Grab it. Make use of it. Because once the momentum is gone there is no bringing it back.

And sometimes, the feelings don't go away when momentum does. But momentum goes away, even if the feelings are still there. So speak up and don't waste you chance, or live with the regret of trying to make your momentum happen again.