<human>: Summarize the given text in a few sentences.

Hi, I go to college in Minnesota. This will be my 2nd year at the dorms. My first year, I had tons of issues with my roommate. I tell this to my new, freshman roommate (we share 1 room) this year about these issues I had with my previous one regarding my privacy (going through my things) and being messy (leaving condom wrappers on floor). She agrees, saying it's disrespectful. 

On Halloween, her bf comes over and I'm awake and on my laptop... and then they started having sex. I confronted her the next morning and we argued. She denied it saying they were getting "comfortable". She then avoids me the entire next week and comes back Friday  (11/8/13) but only enters the room when I'm either a) sleeping or b) not in the room. I leave for the weekend and later that night I see her  tagged on Facebook in one of my sweatshirts at a hockey game. I didn't know it was mine FOR SURE until I came back this Monday night and see my sweatshirt is gone from where I left it. I remember because I washed and folded it Thursday night. 

Today, I see new photos of her with her boyfriend **IN THAT SWEATSHIRT**. It's funny because after we argued her bf says he wants a sweatshirt like mine. I confront her, and she says, "What sweatshirt?" "No, I haven't even been in here."

I can prove it's mine because I have pictures of me in it from 1 year ago (when I bought it) and I just looked and I have the bank statement from when I bought it. I can probably call up the store I bought it from and ask if they still sell it or something.

I already talked to my CA about it and all three of us are supposed to talk about the problems going.
<bot>: Roommate stole my sweatshirt, and took pictures of her wearing it, posted the pictures on Facebook, and denies taking it.