Hey, it's true love. For Ruki anyways. Sacchan, though...
Sacchan wasn't ready for this relationship at the start. Her experience cheating on Ruki has given her a chance to understand herself better. Now she is much better equipped to have a committed relationship. She did a really shitty thing to Ruki, but she isn't apologizing since it's helped her grow. Now Ruki can either forgive her and try to have a real relationship, or she can turn her down. But she's been in love with Sacchan since the series began, so she obviously is gonna give it a shot.
That's what I think, anyways. I'm gonna be really pissed if Sacchan turns out to be just like her old boyfriend. Ruki deserves much better. And you know what? So does Fue. Whatever happened with her, anyways? This series is hard on my heart. I need to go read something nice and fluffy....