I tend to think of it as a cautionary tale, a warning of what NOT to do when you're in a committed relationship. Relationships are about compromise, understanding one another, being there for each other, and being willing to try new things. Satoshi is a selfish and jealous person who takes his girlfriend for granted, and doesn't want to meet halfway about his insecurities. It's either his way or the highway, which is pretty toxic behavior. Even when his uncle tries to give him genuine advice on how to patch his relationship, Satoshi brushes it aside. The dude is not a good boyfriend, at least on the main story path. Most girls don't like being called a slut (dirty talk is a different story, but that's not the case in this context), especially when all they've tried to do all day was make their boyfriend feel special (and it damn near succeeded... were it not for Satoshi's MASSIVE insecurities). The love ending is my personal head-canon because that's what I would have done in that situation, and because that's what being in a loving relationship is all about: Compromising, understanding, being present, and willing to be adventurous. In real life, be like Love Route Satoshi, and NOT like Main NTR Story Route Satoshi