First let me say, that as a female I know exactly what "I only like you as a friend" means. It basically means you're cool and all, but you aren't hot enough/ I don't want to bang you/ I don't want to be seen in public with you. Now that being said, I have never used it in that context, though there are many friends that know they are in the friend zone just because I like having friends, and I'm just not sexually attracted to them. Besides, I like girls so it's a little hard for guys to get out of the friend zone with me.
Now that that is over, I have a rejection story. Ok so, I had a crush on this girl I went to High School with. She was a senior while I was a freshman, so when she left we lost most contact with each other. A few months ago we met up again at a local club and started hanging out kinda. One week we were talking and it finally came out that I had a huge crush on her during the High School years and apparently she was attracted to me also. The week after, we spent most of the time at the club flirting and eventually ended up making out. Now by this time I'm in a happy daze because I've only been trying to do that for 4 years. The week later she bring her boyfriend to the club. And I was kinda (read completely) saddened by this. The good part is that a few weeks later for her birthday I was at her house for a party, and completely hit it off with her roommate (score!) so I'm not as sad about it anymore. And it makes me giggle that her boyfriends a dick.