One of my favorite plots is when the hero is in love with the heroine for years (without her knowing it of course.) I'm currently reading one of them: As You Desire by Connie Brockway. Another one I can remember is Until we meet by Karen Ranney, which I loved.

Do you know any other books with this plot? If so, let me know!

When He Was Wicked by Julia Quinn.  I loved this one.

Madeline Hunter has one - it's part of her The Saint, The Sinner, The Charmer series I believe.  let me go look.

EDITED TO ADD:  It's called The Romantic ---> http://www.paperbackswap.com/book/details/9780553587296-The+Romantic

Princess by Gaelen Foley

Impulse by Candace Camp

It's been a while since I've read it, but I believe Kresley Cole's If you Desire falls into this category  (I'm pretty sure it's the second book in a trilogy, and of the three, my favorite:-D)

Doesn't McNaught's Paradise have this plot? I think it does, but it has been forever since I read it.

I read the Julia Quinn one and started the one in the Madeline Hunter series...the rest I haven't read...I'll check them out, thanks!

Sobia - I have that Kresley Cole on my TBR pile.  That may have to be the next book I read.  I've read the 3rd one in the series already and enjoyed it a lot.

There was a really good Linda Leal Miller "Heartbreaker"  He has been in love with her forever.  He is also older and fought it.  Now she is back and his boss on the ranch he father left her.  I enjoyed. It is an older book.

Here is a list of some, its not just heroes, but it tells you which it is

http://www.likesbooks.com/unrequited.html

Thank you Ashley!

I didn't think of checking the All About Romance site and I go there all the time!

These are some I haven't seen mentioned yet.:

Led Astray - Sandra Brown

Ruthless Charmer - Julia London

Highlander in Love - Julia London

Heartbreaker - Linda Howard

Against the Rule - Linda Howard ( this one may or may not fall into this category).

A Secret Love - Stephanie Laurens ( may not fall into this category but close)

I just thought of another one. 

Sweet Lullaby by Lorraine Heath

Suzanne Brockmann wrote one called Letters to Kelly.

Sherri

Another good one is Scandal in Spring by Lisa Kleypas, which is the 4th book in her Wallflower series.

Diana Palmer writes LOTS of these...books in which the hero and heroine have a relationship prior to the opening of the book. Often the hero was either in love with or was highly attracted to the (usually) much younger heroine.  I've enjoyed many of Palmer's books, though have really not cared as much for her more recent ones.

Letters to Kelly is one of my all-time favorite books.  I cry everytime I read it.

One that's on my TBR list is The Irish Bride by Alexis Harrington.