Hana Yori Dango has this guy who is crazy (like, literally) in love with the main girl... But it takes 2-3 volumes. I don't really like Hana Yori Dango, but if you want to give a try. I'm in volume 18 and they're still not together... I don't think it's the same as the other two too, but this is the only manga I can think right now.