What do you do if you can't trust your own sister?

Anonymous
I recently just found out that my sister has been sending flirty texts to my ex who I still talk to and have feelings for, and who I was hoping to get back together with.

He told me he was texting her because he hates her boyfriend (who he works with) because he's been starting drama at work trying to get him fired. He sid he thought she would tell him, so they would get in a fight.

Im more hurt because the whole time we were together, my sister would tell me that I shouldn't be with him, and that he would hurt me. But she was texting him the second we broke up to ask if he was OK, she never even asked me that.

I have always been competitive with my sister because we have similar personalities (she's 21, I'm 18), so if I had a guy like me she would flirt with them so they would start to like her, and they always would because she is more flirty, so now every guy I'm with that knows her, I'm worried that they are just with me because I'm the closest thing to her.

Im so hurt that my own sister could do this to me, knowing how much I love this guy. He is acting like it didn't mean anything. I have noone to talk to because none of my friends live here anymore and they are always busy. I feel like noone loves me enough to do the right thing by me. I'm the one in the family that always gets walked over and isn't allowed to get angry at her because my parent say 'she's been through alot', but that doesn't give her an excuse. I don't know what to do. I feel sick because of it all.

What do you do if you can't trust your own sister?
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