My boyfriend lied to me about seeing his female friend?

Anonymous
My boyfriend has a female friend who he never cares to invite to our holiday parties or anything and yet decides to go out with her when I'm out of town. He doesn't see a problem with this. Today he lied about seeing her. I was using his phone to send myself a picture he took (with his permission) and saw that she had sent him a message about going to an event today. He hadn't read the message. I didn't tell him I saw it though and he didn't tell me anything about it.
I have her on Facebook saw that she was tagged in a photo in this certain area for this event. So my boyfriend tells me he randomly has decided to go check out a store which happens to be in that area. I don't tell him anything.
So, he sends me a message that he just happened to bump into his friend while he was down there so he hung out with her for awhile to be nice. I know this wasn't a happenstance meeting and that he actually lied to me.
What would you do?
My boyfriend lied to me about seeing his female friend?
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