How do i tell my sister her boyfriends cheating?

[Crystal Marie]

I had a feeling that my sisters boyfriends been cheating on her so i made a fake Facebook page to see if he would go for it and he did he told this me that she is his ex (which i know that he isn't) and wants to meet up with this girl what do i do? How do i tell her she will be so mad at me if she knows its me some advice please ?

[Been There]

Wow. You never should have done that.

First, because it was being enmeshed and that is psychologically unhealthy.

Second, because depending on how much she rationalizes or denies reality, this could make YOU the enemy, not him.

Back out, remove the page, pretend it never happened. And don't cross personal boundaries like that again.

[Know It All]

your sister will be way madder if you dont tell her

[i love NY]

you know, this is pretty simple. just sleep with the guy, take some pictures and show her. better yet, sleep with the guy and make sure your sister catches you and him in bed together.
geez. what's so tough about that? its every guys fantasy to bang his girlfriends sister. trust me.

[?]

Carefully!

[No Special Agenda]

You don't! Why would you do such a thing? Butt out of other people's lives and let them find out for themselves if they wish to make this a relationship or not. Nobody likes interference or making their own decisions even if they do turn out to be a mistake with a guy or the other way around. You crossed an invisible line that means stay out of her business or trying to manipulate her bf into helping him want to cheat or tempting him to so so. Let her make her own mistakes. She will learn how to handle guys who get so easily tempted to go off the right path......

[headvsheart]

Tell her the whole truth as it is... you had your suspicious and decided to test if this guy was good for her, and that is what you foundt. Tell her youre sorry but you really do care for her and wanted to see how this man is like. And then let her decide what she wants to do... She might be upset at first, maybe even mad at you but she will eventually understand. This is all out of sister's love.

[Alexandra]

You could very gently show her the conversations that her boyfriend had with this "other girl". Ask how she wants to handle it. She may want to meet him at the designated spot.

[Kittysue]

Show her. Tell her you only did this because you love her and care about her and kept hearing other people talking about how he was cheating. Say that you didn't want to believe it and the only reason you made a fake account is because you wanted to prove to the other person that he would not cheat and they were just lying. But you found out that he is cheating on her

But be prepared - she might hate you for this and become even closer to her bf because of it. I've seen it happen before - they get mad at the messenger instead of the cheater