I caught my guy friend going through my underwear drawer?

So me and my guy best friend are really close and we hang out almost every day and he comes over almost everyday. Today when he came over we were in my room watching a movie and I left to get us some soda. When I came back my door was cracked and I saw him by my dresser going through my underwear. I acted like I didn’t see and made some noise coming up the stairs so he heard and we finished the movie. I don’t understand why was he was going through my underwear though. Should I confront him about it? I feel a little violated.
I caught my guy friend going through my underwear drawer?
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