Why would he do that?

My buddy and I went out a couple weeks ago and I met a girl. The girl and I were having a great time together!! To sum it up i was in a relationship that was going to end very soon and was going very bad... and I planned on telling the girl I was talking to when we were out but my buddy took it under his command to tell the girls friend without asking me first. Why would he do that?

Why would he do that?
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