India, June 3 -- Often, couples in long-term relationships start wondering how to keep their relationship alive. They end up feeling like the spark is lost. But have you ever stopped to think why it happens?

According to couples therapist Jeff Guenther, there is one thing that kills desire in long-term relationships. It is not 'stress, boredom, ageing or falling out of love'. Rather, it is something quite common and it sneaks up on couples unaware. In a video shared on May 8, Jeff shared what to do if you want to get that spark back.

"It's emotional fusion," the relationship coach said in the video. Now, what exactly is that? According to him, it's when two people become so emotionally entangled and merged that they slowly lose their in...