Okay, this might get a little long, but I need honest opinions.

I (19F) share a 2-bedroom apartment with another girl (also 19F, let’s call her Emily). We go to the same college but aren’t close friends—just roommates. Things were chill at first, but about a month ago, she started dating this guy Tom (20M), and since then… it’s been chaos.

Tom is over constantly. Like, practically living here. He eats our food, leaves trash around, and is just generally disrespectful of shared space. The worst part? He’s started using my shampoo, towel, and even razor in the bathroom. I found out when I noticed my stuff was moving around and then actually caught him coming out of the shower with my towel around his waist. I was mortified and furious.

I told Emily it made me uncomfortable and that he shouldn’t be using my personal stuff, especially without asking. She brushed it off with, “He probably didn’t realize it was yours,” even though my name is literally on everything. I told her if it happened again, I’d take action.

Well… it happened again.

This time I came home early from class, and Tom was in the shower. I knocked, waited, and when he came out, he smirked and said, “You should label your stuff better.” That was it. I snapped.

That night, I changed the WiFi password and locked the chain on the door so he couldn’t get in when Emily wasn’t home. She was out late with friends, and he apparently came over and tried to get in but couldn’t. He called her, and she called me screaming that I was being immature and petty. I calmly said he doesn’t live here and I don’t feel safe with him using my things after I’ve repeatedly asked him not to.

Now Emily’s calling me the asshole and threatening to move out before the lease is up (which would screw me over financially). My friends are split—some say I was right to set a boundary, others think I went too far by locking him out.

So Reddit… AITA?