Co-worker friend texting my crush?

So there's a new girl at work. I had told my close friends that I like her. we talk at work sometimes, did not exchange phone numbers yet.

Recently I found out one of those friends started texting her not too long ago (saw the messages myself, he does not know that we know). He hides the fact that he is texting her. Whenever her name pops up he says she is all yours I am not going to come in your way.

What may be some of the reasons for anyone to act like this. I am trying to get him to just tell us the truth. I also said I am not interested in her anymore so that he would feel comfortable talking about it. I'm okay with him shooting his shot but not like this.

Co-worker friend texting my crush?
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