Thanks for the chapter!
She's up to something, and likely playing him for a fool. Granted the demon she summoned was looking for a scapegoat (will probably find out what for later,) but she's got too many smirks like she got away with something appearing here and there along with her eyes being red in the mirror. Might even be a demon herself. Although it's great that MC is trying hard to help her despite his girlfriend's betrayal. Hopefully find out more about why she was at hotel and what doing there with that guy as if she was being threatened or blackmailed she wouldn't have grabbed MC to make him stop. Would like to believe she's really in trouble and not cheating on MC, but need more info one way or another to know for sure. On the other hand she did apologize to MC, didn't ask for a breakup, and didn't mock MC in front of rich guy or pamper rich guy's ego but looked cornered so something up.