When someone say "you using me "
What do they mean by that?

It means that they feel you are taking unfair and unreasonable advantage of your relationship with them in order to get something from them. For example, it would be "using someone" if you only called a friend when you needed to borrow money from them. It would be using someone if you were a man spending time with a woman to get sex from her when you had no intention of pursuing a relationship with her. It would be using someone if you didn't like them but stayed on their couch because you have nowhere else to go. It's treating a person you are in a relationship with, who's company should be enough for you, as a resource for something else - sex, money, favors, etc. Generally in these relationships, the user takes and takes and doesn't give anything back.

What about if all girls have a crush with the same guy and someone pretend to be nice to someone that is in a relationship with that person and they pertrade them by there fake friendship feeling just to steal that person from her, is that called using

Yes.

What does "pertrade" mean?

Otherwise, yes, agree with everyone.

What does "pertrade" mean?

Otherwise, yes, agree with everyone.

Read the sentence and pronounce the word... I THINK it is supposed to be "betrayed".

I thought maybe it was pretend - yes, I understand the translation now that I've re-read it.

If I understand this right... the scenario is that several girls have crushes on the same guy. The guy is dating one girl. Another girl befriends the guy's girlfriend in hopes that it will get her closer to the guy.

If the motivation of befriending one person is to get access to someone else they are close with, yes, that is "using".

Read the sentence and pronounce the word....I THINK it is supposed to be "betrayed".

Yea I tried that's what I thought to.
Sometimes I don't listen to myself.