A career-focused artist demands a ‘share no details’ rule with her one-night-stand, but becomes tempted to break her own rule when they start to bond during the disastrous night.

What are the stakes? Why is it important she they don't trade personal details? This is the centerpiece of? your plot, why is it such a bad thing that they start to get to know each other?

Not sure what the story is from the logline - Das ist nicht gut!

What does she want as a result of the bond? A relationship? If so what kind (she can't possibly be in love after one night)? What does she do to get what she wants? These are the most important pieces of information a logline should contain but are missing in this version.