Why do I get butterflies only from one guy?

Because he is the only guy you have crushed on this hard.

Doesn't necessarily mean you're destined to marry, or even that he's crushing on you so hard. But it does mean that at this particular juncture, he's the one for you.

Just don't panic and avoid him because it's all too much, nor should you flip out and stalk him and drive him away. You should be able to focus your girl powers squarely in his direction (flirt, talk, hang out, get him one-on-one, "accidentally" bump into him at the most "surprising" times, so on) and at least get clarity whether or not he wants to be with you. For your sake, I hope so!

Maybe he's extra cute, or he has the same personality as you. I think it's probably because he speaks the same 'love language' as you--I know it sounds gay, but it's actually a cool idea. Some people tend to communicate their love (not just crushes, but friendship and affection too! ) by touch, some by talking, some by gifts, and some by doing little favors. Whatever it is, it sounds like you two might have the same one.

But maybe I'm mixed up, and you're not getting butterflies because of how well he flirts--maybe it's just him. Have you ever heard the phrase 'cute couple? ' Evolution came up with that idea millennium ago! The people you fall in love with are the people you'd make a good couple with--physically or emotionally. It could be that he's extra good for that.