From what I've observed in playing the 5 times. This is how I got all 3 traits
Yandere/Obsessive:
You treat her good, pat her daily, etc. Basically treat her good. When you get the option to touch her when she's sleeping, you do it and you should get Yandere/Obsessive
Lover/Affectionate
Treat her good, pat her daily, etc. Do everything just like Yandere/Obsessive but don't touch her when she's sleeping. After she wakes up you get a new conversation with her (I ain't spoiling what she said)
Slave/Mournful
Basically you just treat her bad. No pats, select all the bad options, touch her in her sleep, etc.
Just treat her bad and you should get it. It's important that you don't hug and kiss her. Tho I'm not sure it'll affect it but don't do it just incase