Can anyone explain why he would do this?

This guy is my college friend and we chat quite a lot. We are flirty and have also sexted but never shared anything inappropriate. Now, suddenly he tells me that he is going on a trip with a girl and she has asked him to stay away from distractions. He never really mentions any girl. Why would he do that all of a sudden? Did he say this so that I don't text him when he is with the girl?

P. S. We have been chatting for around 2 years. Lots of inane chatting, fun talk, flirty and silly memes mostly. He is a smart, educated and a nice guy

Can anyone explain why he would do this?
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