Issue: My best friend started dating the person I like, when my friend knew I liked this person. I don't want to tell my friend anything anymore and I feel betrayed. I don't think I will ever be able to trust my friend again.
Insight: My question to you is have you told your friend how you feel since this happened? Your best friend may think you stopped liking that person, or your friend might have thought it was alright if that person liked your friend but didn't like you in that way. You need to find out why your friend did it before you can decide if your friend has broken your trust or not.
If your friend has betrayed you then you need to decide if you want to continue the friendship or not. If you do, then you should probably forgive your friend and move on; however you may want to be cautious of what you share with your friend until the trust is rebuilt. If you decide not to continue the friendship, then I would suggest you still forgive your friend. Forgiveness is not letting your friend off the hook, it is setting you free from the pain your friend caused you.
If you have already expressed how you feel and your friend doesn't care that you were hurt by it, you may want to evaluate the friendship. Once again, you would need to decide if you want to continue this friendship or not. If you decide to keep the friend, you might want to distance yourself from them and find a 'best' friend you can trust. If you decide it is time to move on, you might want to let them know why you have decided not to be friends anymore. Either way, you should still forgive the person, which will enable you to move on from this situation in a healthy way. Always remember, there are consequences for our actions at any stage in our lives.
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