sad + happy = SADAPPY

Human psychology and behavior is predictably irrational or can be rationally predicted. I noticed an unusual behavior that sometimes people chose to be Sad because feeling sad makes them Happy. This is unusual for me, a guy to understand why someone would choose to be sad but apparently two of my friends (whom are female) agree with behavior.

They shared that sometimes they like to be sad and choose to be sad especially at night and being sad gives them some sort of unusual pleasure.

Does this provides us a glimpse into human behavior and actions sheds light on why when some people still want to focus on what is wrong in their lives rather that what is right. Because maybe on some level being sad gives them conscious/subconscious happiness

So is there a new emotion, where being sad makes you happy, thus SADAPPY?