Could it be?

I live with my fiancé and I came home and noticed that all my lotion (I have 5 lotion bottles) they are all empty. ALL of them. I don't use lotion very often. Maybe when I get itchy from the winter time but that's it. I have a feeling that he is using them to jack off. I have never, in my life, used a whole bottle of lotion. I keep asking him and he gets so mad and defensive. When I ask why he keeps getting mad, he said "I'm sick of hearing about this" and then changes the subject.