Many things in life are one-time shots. Actually, most of things are. People always say that opportunities are one-time shots. If you take it, then you make it. If you miss it, you lose it. But in most situations, the truth is you have other opportunities, many. But what's crucial is you lose the morale, the courage, the fighting will. Like it was written in the antient classic, the first fight is full of morale and courage. The second wanes. The third drains. The unnoticed but critical truth is we have the first shot, the second one and the third one. But we put all our courage, energy and focus on the first shot. We make our first try with all our hearts and spare no efforts, a fully performed try and probably the most brilliant show. You can still have ambition, still want to win desperately, but it's just impossible for you to acquire the first time's commitment and immersion. It's the same situation for relationship. The ebulient happiness and contention are luxury for a person who had been through many relationships. He will has much higher expectation after tasting so sweet or romantic love.
So the wise step is always put your best foot forward and always remind yourself that just live with it and be happy if you miss it cuz life is going on and on. So much unseen or even unpredictable surprise and happiness await you and they will only come to you when you expect them.