Right to be angry or not?

Well long story short I was on my boyfriends phone and looking at his facebook messages (not expecting to find anything just bored) well I was going through one to a mutual friend and he's been friends with her longer. Anyway I was skimming and I got to this one part where he said something along the lines of 'as a friend I think you're very pretty and have a wonderful personality' I couldn't get past that to remember the rest but none the less I got very upset at the fact he called another girl very pretty with an amazing personality. I confronted him and he said two people she loved just up and dropped out of her life (like friends just left/friends aren't speaking) and he was trying to make her feel better. I'm still upset about this.  Do I have the right to be angry or not? I just felt betrayed.

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