You find out that your best friend has been lying to you about something that is important to you.

Vous découvrez que votre meilleur/e ami/e vous ment à propos de quelque chose qui vous tient à coeur.

Confront him/her, possibly end the friendship.

confront them and demand an explaination

Feel hurt. Confront him/ her until he/she is honest.

I am upset initially but then I try to understand why my friend lied to me.

I confront her.

i would be hurt; i would try to talk to him/her about it

I would confront her about it.

I would confront her kindly and ask why she did that.

I would confront my best friend and tell her that I found out that she was lying and ask her to talk about it with me.

I would confront my friend about it after thinking a lot about what to say.

I would confront my friend about the issue.

I would confront my friend, make my feelings clear, and ask for an explanation.

I would confront them.

I would demand him to tell me the truth.

I would feel very hurt and angry at first. Then I would begin to question whether the lying was done in good intention or not.

I would get very upset and then forgive my friend.

I'd forgive him and attempt to understand his circumstances

If this issue is important in the sense that I am personally interested in, but is actually his or her own affair, then I will leave him or her alone. If it is an issue that relates to me directly, then I will confront my friend directly.

It would hurt me and I would confront her about it.

This has happened to me before, and I would forgive him as I have done in the past, in most circumstances.

"peut-être, il a ses raisons", je lui fais sentir que je sais qu'il ment.

Alors je n'ai pas su bien communiquer avec elle pour qu'elle soit obligée de mentir, donc elle n'est pas ma meilleure amie

j'attends son excuse dans quelque jours, s'il y a pas de réponse, je vais le lui dire par moi-même.

j'en discute avec lui

j'essaie de savoir pourquoi il m'a menti, je suis blessé mais je lui pardonne vite

je le lui reproche et garde mon amertume le temps qu'il faut pour pouvoir en reparler ensemble calmement.

je lui en parle clairement, posément.

Je lui en veux énormément et je lui fais savoir. L'amitié passe par une franchise absolue.

Je lui ferai une remarque

je m'attriste, dans un premier temps je ne dis rien

je m'explique ouvertement avec lui

je me fâche avec lui

Je suis déçu et j'essaye de comprendre pourquoi elle me ment.

je suis vexé : je fais la tête ...

je suis vraiment attristé, je le prends très mal, je n'aime pas le mensonge

je vais la/le voir pour savoir si c'est vrai

Je vais parler avec lui pour savoir la raison pour laquelle il a menti.

une explication s'impose...