Is it normal to get upset over a friend you have a crush on?

Okay basically my close boy mates don't get upset or anything over girls the way I do but they've both been in Long term relationships whereas I haven't, so that's why I think that is.
Recently I've become really close to a friend which I get in great with and I think she's gorgeous and I get butterflies whenever I see her or speak to her. She flirts with me and kisses me and arranges stuff with me, but she does it to other boys too just not as much as she does with me.
I've begun to really become attached to her and think about her all the time. I said something to her lastnight at a party and she told me there's reason why we can't become any closer and she can't tell me why.
I went upstairs later on and felt so bad for myself it's pretty embarrassing, I ended up crying in the room on my own which is pretty funny now that I look back.
I've been upset since lastnight and she's ignored my text. Is this normal for a boy to feel like this? And what can I do to start to feel better?