It's just like in the stock market:
Before you buy a share of a company you check it out and if, and only if, you are convinced that it is a good choice and you are willing to keep it forever you should buy. If you are not convinced you would want to keep it forever, forget it.
If you allready own the shares and the company is about to do something stupid, get rid of them before it's too late!
We cannot know the future and we live in the NOW. Just always try to make decisions at the right time to make them, not sooner, not later.
The best you can do will be enough, you'll see ;)
Have a good one @alynx. Thanks for the upvote ;)
What a great analogy, but of course relationships are a little more complex cause people start to get irrational due to feelings. :) Thanks for your comment and for dropping by! :D