A friend called to discuss the elements of a tough choice. I also had a tough choice recently. Tough choices can sometimes be narrowed right down to doing what's best for yourself or for another. Fortunately, in most cases, you can find a compromise that helps both people, but sometimes that's not possible.
When I make a tough choice, I generally weigh the pros and cons, and also consider the worst case scenario of the choice.
Then when you choose, you have to be satisfied that you made the best possible decision with the knowledge you had, and the thinking you did. Onward.