Um I have a situation

putting "kill her" as an option just tells me how immaturely you're looking at the situation and how you're not thinking why she did this. you're thinking in the retrospect "why did my friend have to backstab me like that just because i tell her this doesn't mean she has to blab about it"

lemme put this in a point of view あなた can understand. it may not be a good view, but i feel the need to drill it in your head
you're the one who told her about this crush. あなた disclosed this information to her, and if あなた didn't want her to say anything, why didn't あなた tell that to her?"
now, i'm not saying あなた didn't. i don't know if あなた did. i'm also not saying that this is your fault. it is something to keep in mind though.

telling her crush she likes him will NOT SOLVE ANYTHING, AND WILL PROBABLY COST あなた A FRIEND. REVENGE, または PAYBACK OF ANY SORT WILL NOT HELP YOU. IT IS A CHILDISH RESORT. just, no.

ignoring the problem will not make it go away. it will still be there, and it will lurk in your mind for as long as possible. ignorance may be bliss, but there are some situations where it doesn't apply. she may take your ignorance in a negative connotation.

being フレンズ is optional with the boy (if that's what you're referring to), but only if あなた feel comfortable with it.

i suggest あなた tell your friend that あなた didn't want her to tell everyone about it, and that personal information like this is meant to be kept between friends, not become some petty gossip story. as for the boy, あなた could probably 確認 the feelings あなた have for him, but in reality what あなた do is up to you.

あなた could easily ignore everything i said, that's fine. in reality, あなた control what happens next. i'm just giving あなた different 閲覧数 so that あなた can choose your path carefully

ignore the problem and pretend it's not awkward. it only makes it worse if あなた make a big deal out of it.

Well maybe your friend didn't mean to make あなた feel embarrassed によって her telling your crush that あなた like him, she might have wanted to let him know so あなた wouldn't have to tell him. I think あなた should ignore the problem または try to tell her that あなた didn't like what she did....but I'm guessing that あなた two aren't very good フレンズ anyway if あなた want to kill her so badly....

Why is this such a big deal?

I mean, he now knows あなた like him right?

I'd just forget the problem, because it doesn't really seem like one.

あなた choose what あなた think is right/needs to be done. Just know you'll go to jail if あなた kill her. ^-^

あなた can choose whichever あなた think is right. I personally would just ignore the problem and not make a big deal out of it and I would not kill her. She's your friend,sure she told him あなた liked him in front of everybody but あなた can simply ignore her for a bit until she realizes she shouldn't have done that. Deciding to kill her is taking things way too far and will just make もっと見る problems.

Why do あなた care so much about the problem if it's already been 発言しました in front of people?
Having fear of something あなた think is not okay isn't a bad thing, if あなた want to set things right then do it.

All of the above.

Well did this boy accept you?