She was talking about loving/wanting someone that isn't good for you but it can be applied in other areas too.
"Wanting something/someone that is bad for you so much that you can't see your way past them to leave, is a lot like looking at a dessert table and on it, in the middle, sits this delicious dessert that you really, really want but you know it will make you sick if you eat it. And even though there are many other desserts on the table that you can have, and are okay for you, your focus is so strongly on that one in the middle that you can't see the rest of the perfectly good desserts around it."
To get yourself out of that place in life you need to step back and look at all the other wonderful opportunities and people surrounding you and get your focus off the one thing that is tearing you apart. True love does not bring fear of pain with it.