Lost socks

When we’re in college, we need to stay near to our school with our classmates. I have this classmate that is very manly(siga) and very active in having a lot of girls lol 😂. I suddenly noticed that my used socks (after wearing it whole day from the school) always went missing after putting it inside my shoes or laundry basket just to see it underneath my classmate’s pillow. It is only coincident? Knowing that my classmate stays on a different room from me and he has the ability to get my belongings unnoticed. Does anyone have the same incident? What are his intentions? Haha