I think she's just jealous of their relationship (that they're both probably mutually in love, even if it's taking some time for them to realize that), and it explains why she was always poking at their relationship in the past chapters and trying to stir stuff up. She said she was bored in ch.5, but here, she admits she was just jealous that they can keep liking someone without forcing yourself into inaction or towards someone else.
"This is as good as it gets" is probably referring to the fact that it's real, unlike the otome game, and because "It's fun to like someone, you can never get bored. Love is a beautiful thing."
Edit: Also, I'm pretty sure this volume in general's going to be focusing on adding other characters and how they see our main duo's relationship because Maihara and twintails is on the ToC. I like how the mangaka changes up the imagery each time based on their names though. I wonder if glasses-chan's name has something to do with birds?