Did Nichkhun and Tiffany calling it quits break your heart as much as it did mine? It seems like South Korean celebrities are announcing their relationships to the public all the time now. Fans across the globe are crying and cheering for their ultimate happiness. However, some relationships just don't work. The two stars never click, and something goes haywire. 

I'm here to try to figure out why a few of our favorite stars end their love affairs too soon. 

1. Their schedules hinder them from spending time together.

Actors and singers work round-the-clock to properly entertain us. However, working 12- to 16-hour days takes a huge toll on the love lives celebrities try to make for themselves.

SHINee's Jonghyun and Shin Se Kyung couldn't find enough time to be together.

2. Co-workers are hotter than their current beau.

It is impossible not to fall for sexy co-stars like Rain, Lee Min HoJung Yong HwaPark Shin Hye, and Krystal. Kissing them on-screen may even make a faithful beau wander.

Rain's relationship isn't in any trouble, but I want to illustrate the temptation stars have with gorgeous co-stars. It's a win-win for both Rain and Krystal. 

3. Their significant other is boring.

Everyone gets tired of the same thing over and over again. There is nothing wrong with their lover; they just want someone new for no obvious reason. It's kind of like wanting a new toy when you are a child because you played with your other one so many times it's not fun anymore.

School 2015 illustrates this idea well. There is never a boring moment for Eun Bi! I wonder who she will choose in the end? 

4. One person in the relationship is blinded by the other being too fabulous.

Lee Min Ho and Suzy are equally fabulous, so they don't have to worry about upstaging each oter. Other couples may have to deal with one's popularity soaring, while the other's career falls flat. There could be a very fine line between love and jealousy.  

5. The paparazzi hounds you.

It is probably impossible to have a romantic date when cameras are flashing everywhere and strangers are following your every move! A relationship can't last past the stalking point. They need privacy to survive.

Girls Generation's Yuri and baseball player Oh Seung Hwan need to be left alone. 

What other logical reasons would you add to this list? 

When a poor young woman poses as an heiress and meets a wealthy man, can she keep up the charade and survive in high society? Find out in the thrilling melodrama Mask:

Shelly M is an author and blogger. Follow her personal blog at BTSCelebs.com