When is a GOODbye…GOOD?

Ugly Betty may not be the best girl to go to for dating advice but, she got me thinking the other day.
Here’s what triggered my thoughts…
“I’ve had to say goodbye more times than I’ve liked, but everyone can say that. And no matter how many times we do it, even when it’s for the greater good, it still stings. And though we’ll never forget what we’ve given up, we owe it to ourselves to keep moving forward. What we can’t do is live our lives always afraid of the next goodbye, because chances are they’re not going to stop. The trick is to recognize when a goodbye can be a good thing; when it’s a chance to start again.” –Ugly Betty
I’m a believer of “LOVE CONQUERS ALL” and Betty Suarez here is saying we sometimes have to let our loved one go for the “greater good’? I agree there are certain situations that can be difficult in keeping a relationship- long distance in many cases or friends and family’s disapproval (I’m throwing possible situations out there). However, no matter how difficult the situation is, if the two love each other and have the patience and strength to fight through, there is no need to part ways. I say “recognizing when a goodbye can be a good thing” is an excuse and is a way of giving up on the relationship.
Why can’t people love hard even if it entails heartaches and fighting through challenging times?
What do you think? Is this a cowardly excuse to get a chance to start anew OR is there really a GOOD goodbye?