A lot of us tend to slowly drift away from past friends when we're in a long-term relationship, let alone a marriage.

If possible, try not to look at your marriage in terms of the time that you lost.

If things weren't working out and you made the decision to end it, you made the right decision, as difficult as it may have been.

Now that you're single again, it's a great time to reflect on some of your friendships that you might have neglected and reach out.

We hope the advice in this guide will help things go down a little easier for you.

In economics, a sunk cost is past investment that has already been paid and cannot be recovered.

Regardless of how long the marriage lasted, what stage in your life you are right now, and how well or poorly you both handled the situation, this is still going to be a difficult time.

It's easy to lose perspective when we're facing the uphill battle of getting on with the rest of our lives, but the good news is that it doesn't have to be all bad.

It's why we cancel better plans and drag ourselves to a restaurant we didn't want to go to because we bought a Groupon.

But the same principle also tends to keep us in relationships (and even more so marriages) that aren't working out -- because we've put so much time and emotional resources into them.

Unfortunately, in an attempt to derive value from poor investments we often try to justify or invest further despite it not being in our best interests.

It's why we pour needless money into poor purchases of cars or homes that require constant repairs.