I really love this series. It presents characters as actual adults, adults who have adult reactions and interactions, and keeps on theme of discussing complex and realistic subjects - in fact this one chapter, we find out the dumbass situation and how she thought "only holding hands" wasn't cheating, but most of us would consider that cheating on some level for sure. Next we hopefully get to see what exactly led to that situation (I assume Ayaka, in some way), but either way emotional cheating, holding hands with someone else in that fashion, whatever it is, can and usually is cheating.