Search Results: everyone makes a big deal

My best friend (of the female persuasion) told me she wanted to have a summer fling with me, just casually making out. She originally said she wanted to kiss other people as well, but later on she started getting really flirty and she told me I was the only person she wanted.

I have never kissed anyone, so this was a big deal for me, and she knew that. She said she wanted to make it as special as possible. She started wearing special outfits I liked, and she sent me pictures (clothed) of herself with (and I quote) "extra boobage" because she knew I liked it. :P

However, before we ever had the chance to start our fling, another guy drove her home, and she made out with him. She had kissed him a few months prior but she didn't date him because after their kiss he stopped communicating with her and she felt used. But now not only did she make out with him, but she let him feel her boobs UNDER her shirt.

She told me this, and she said she didn't feel guilty about it either. This really hurt me, because she led me on and made me feel like I was special, but then she went farther with this guy in one night than she ever said she'd go with me. I even asked if I could go that far with her and she said "no, I don't want to take away your innocence" even though she once said she wanted to have SEX with me! What?!

I told her I was disappointed and kind of angry, and she got really mad, and she refuses to speak to me. She says to give her space until this Friday to see if she forgives me. I don't understand why she's angry at ME, when she led me on. I think I have a right to be frustrated because now she says that she doesn't really want to have a fling with JUST me, she wants to make out with everyone she likes.

I think that I have a right to be exclusive with her, and she led me on to believe that she wanted to too. Now she's irrationally angry at me and I don't understand why.

Here are my questions:

-Did she lead me on?

-Is my anger/disappointment justified?

-Is HER anger with me justifiable? Or is it because she feels guilty?

-Should I still make out with her? I want to, but honestly only because she's very attractive.

-Should I only make out with her if the fling is exclusive?

-Why do I feel like this other guy 'won'? Did he? And would I have to go as far with her to say I 'won'? Why am I thinking this way?

Thank you for reading and I'd love some answers! :)