Agree, it’s kinda stuck and extending in a lot chapters. Is it necessary? Maybe not, but I like how slow paced it is as they take the time to sort out things in themselves first.
The thing is that Tagami is too insecure about their relationship, which made Mugi feel bad because she thought, she wasn’t able to reassure him. They are just complicating stuff. Which isn’t Hiyama’s type. I think he’s either gonna get an explanation with Tagami or try to snatch her from him since he’s doing nothing to make up with Mugi and is only making her sad.
Probably the cliche of "I can give her up if she’s happy with you, but she’s not so I’ll take her away from you"? Aaah I hoope!!! >_<