I have a friend whom I trusted so much. I always told her the truth, and I was very open with her. But yesterday I found out that she was lying to me about something she told me before. I am so heartbroken presently, and I don't know how to get over it. I always trusted her and thought that she would never lie to me. I have noticed that I easily trust people and I'm always open with them, but they always take advantage of me by breaking my heart. Sir, please advise me.
It is disappointing to find out someone isn't as trustworthy as you thought. When someone does you wrong, it is part of your responsibility to tell them. "Moreover if your brother sins against you, go and tell him his fault between you and him alone. If he hears you, you have gained your brother" (Matthew 18:15). Hopefully, by bringing the problem out into the open, it can be resolved. If it cannot be resolved, then you know you cannot trust this person to always tell you the truth.
This doesn't mean you have to change your nature and not trust anyone. You are better off assuming the best of everyone and then being disappointed in some than to assume the worse of everyone and feel that you are proven right. "Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them. For those who are such do not serve our Lord Jesus Christ, but their own belly, and by smooth words and flattering speech deceive the hearts of the simple. For your obedience has become known to all. Therefore I am glad on your behalf; but I want you to be wise in what is good, and simple concerning evil" (Romans 16:17-19).