Out of the blue my boyfriend's best friend blocked me from social media... What happened?

Anonymous
Out of the blue my boyfriend's best friend deleted and blocked me from Facebook. Little days before we talked through facebook, he shared a problem with me (he broke up with his girlfriend because she cheated). He told me that "I am a good girl" . One day I helped him with a problem he had and he told me that "he will never forget that I helped him", he asked about my news and things like these. I told to my boyfriend that we talked because at the past the time that his friend needed my help about something and I didn't considered important to make aware my boyfriend of that after the boyfriend told me that I should have told him about this. After some days, I asked my boyfriend if I can share with his friend everything that I feel comfortable to or he prefers more if I speak with his friend typicaly. He told me to do whatever I want at first but after to speak typically with his friend, not to share many things about me or about me and him (the bf). His best friend knows that I have a relationship with him. The next day his best friend deleted me and blocked me. Why he did this? Also, I want to add that I am not the type of person who will add someone after we met, so I have met many of his friends but they are not at my facebook friend list.
Out of the blue my boyfriend's best friend blocked me from social media... What happened?
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