So often times I am asked what the difference is between long happy relationships and promising relationships that fizzled out. The easiest way to answer that is to say that couples who last have a triad relationship rather than a singular relationship.

What does that mean?

These 15 celebrity couples were chosen because they have been married for more than 15 years to each other.

One or both were married before. Some had children from other relationships.

Some have endured divorce rumors, as well as other nasty threats to their marriages.

They are still together (or were until death) so they must be doing something right!