I haven't read it but I heard
Spoiler (highlight to view)
Ichigo 100%
fits. What else? I think GE could sorta fit depending on how it ends. I would prefer a scenario where a guy dates a girl, things fall apart, and he ends up w/ someone else. A guy has to be the main character. Like I said I could think of plenty of shoujo, josei manga where the girl picks someone else but not the other way around.