The devil wears glasses and a mask apparently 0_0
She outed her girlfriend. That's messed up even if it was "out of love." Although it's clear she also did it out of jelousy and a desire to claim her so others would know sakine is taken. Pretty awful of her.
Don't forget that sakine is forcing herself onto the mc though so she's not a saint either. In fact, I'd argue she's worse...