The next time this person asks to borrow something from you, make sure to make your feelings known.
Here is an example of a response to the question “Can I borrow such and such?”
“Not this time. On every occasion that you’ve borrowed something of mine, it winds up never being returned. I value my personal belonging, and it hurts when you continuously fail to return them to me.”
Hopefully, that person will respect and understand your feelings regarding the situation.
If not, don’t bother explaining why you won’t let them borrow something of yours, just say no.