Caught my room mate in panties drawer

F19 so a few days ago i had just got back from work it was about 7pm i didnt know my roommate was in hes 20 and up to this point we have had a good relationship, anyway i walk into my room and hes in my drawer for some reason i can see his hand drop something quickly so i say what the hell are you doing, he says he was looking for spare socks but even that is super weird without asking first. he kinda scurries out the room and says hes going to the shop so i look next to my drawer and theres like 3 of my thongs on the ground and a few of my lingerie sets were dug up. hes super shy so im not sure what to say too him?