I want a manga where the girl confesses or openly shows her love towards the guy, but gets rejected. She doesn't give up and continues to pursue him and tries to make him fall in love with her. The guy sees her as a nuisance, but she soon warms up to him. After somethings happens, he realizes his love for her, but is too late, or almost too late. The manga doesn't have to be exactly like I'm saying, but it has to follow the same story line. Some examples that I have read are Crazy Love Game and (sort of) Skip Beat.

I don't know about the almost too late part, but these have girl falls in love first+she pursues the guy+the guy annoyed at first:
Nodame Cantabile
Ootagawa Junjou Lovers
Lovely Everywhere
Tennen Pearl Pink
Uso Kano

DONDAKEE!!

Strobe Edge
Bambi to Dhole
Aoba-kun ni Kikitai Koto
Koi Furu Colorful - Zenbu Kimi to Hajimete

Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus