I hear you, this situation does suck.
Its like when you talk, they pretend nothings wrong, but theres this giant elephant in the room and its like shes oblivious to it, but at the same time, she treats you like a prick.
This can happen but it doesn't always turn out that way. My freshman year of college, I told a friend that I had feelings for her and it made things extremely awkward for the rest of the school year and she didn't even talk to me over the summer. To make things even worse, we already had made arrangements to live in the same apartment the following school year.
I was really stressed about it, but things ended up working out just fine. We basically returned to the level of friendship we had before and even lived together the following year. She still continues to be one of my best friends and we have a strictly platonic relationship.
I think we were able to achieve this by never talking about that incident. You have to realize that you can't force someone to like you. I let her know my feelings, her feelings were not the same as mine, and I just had to move on and readjust my feelings. It's not very inspirational or romantic, but it's the sad truth of life. Although I must admit, I have had a tougher time with this approach with failed relationships.