I just messed up my friend's relationship with her bf because i too concerned about their relationship and advice my friend but in the wrong way until i made a scars in her heart.Am i wrong?

It is usually not a good idea to interfere in other people relations unless you were worried that your friend is about to be hurt. If that the case it is understandable that you felt a need to jump in and help.

I think you should try and talk to her in a calm and collective manner and explain your concerns to her . You should also listen to what she has to say and try to understand her view point. If you have caused her harm without intending to then you should also apologize to her. You are not wrong for being caring and protective over your friend because it shows that you Are a good person. We all make mistakes and you can overcome this. Just remember to stay calm and reasonable and I wish you good luck