They have a contractual relationship. Objectively speaking, there's no reason for jealousy.
Girl she doesnt even consider the guild guy romantically. She didnt look at him once and blushed (only cus of the noise). So how is that a date. Plus she isnt even actually married to herdin. And even if she was, she sees the guild master as a business partner. The only reason she even felt guilt was cus the guild master said its too early to cause a scandal
She thinks the ml killed her. I mean imagine a man has the audacity to plan your murder but he gets in your face about being trustworthy. Anybody would be mad
Okay why is she so mad? Woman you went out on a date with another guy....And if u do actually escape he will find out and become fuminggg.
spoiler:
I just went and read the novel for the next chapter....he apologised...but like? Ugh idk