My friend knows i like this boy and she sometimes support me on it, i didn't feel comfortable with her knowing that she used to like him. One day i sat next to him with my friend with me, and he was telling me about things him and my friend would do together. I was mad i could've killed her, but i let it go, was that the right thing to do???
No, I think you should have killed her. Of course letting it go was the right thing to do. I can relate with what you are describing here. Growing up there was a friend of a friend who I was not personally friends with that followed me around like a shadow. He always ended up with every girl I dated and I found that too annoying to be coincidence. Eventually I ended up becoming good friends with him even though we clashed because of women many times. So what am I trying to say here? If the person you are dating is easily swayed by your friend, then chances are you probably don't really want to be with that person. Wouldn't you rather be with someone who doesn't even notice the existence of your friend? So if you are constantly pulling guys off your friend when they are with you, why would you get mad at your friend? Shouldn't you be placing the blame where it really should be? On the guy? Sure your friend might be the cause, but she is actually doing you a huge favor. When the guy comes along and your friend is flirting with him and he isn't giving her the time of day because he is with you, that is the guy you want isn't it?
The same problem happened with her and my ex-boyfriend, she would just flirt with him. Should i trust her, should i be her friend???
Trust that your friend will be your friend but I think you are placing the wrong kind of trust in your relationships. You can't get rid of your friend and expect your relationships will fix because of that. If you get with a guy and he is willing to get caught up in anything that comes along, getting rid of all your friends will never prevent that. So keep your friends, get rid of the guy...