It starts small. Like a brush or makeup, shampoo or toothbrush. I see it coming from a mile away these days. Awhile back one "accidentally" left her hair clips after her dick appointment. Went directly out of my house and ran to her car and put in inside her passenger seat. She said "its fine, just leave it". No. Dont ever let them leave things, EVER! It's a simple and very easy shit test. If you do, you'll eventually start seeing her being "overnight" clothes and it will always snowball out of control. Your home is your castle, treat it that way and always protect from the invading army.