What to do when I don't like my roommate's boyfriend?

I've been living with my roommate since August. When we decided to move in together, she was not dating anyone and I am in a very long distance relationship (he lives abroad). However, just after the semester started, she began dating this guy she met at her summer job. Since he lives about 5 hours away, he often stays for at least 4 days whenever he visits. What she refers to as him being "very shy" often comes of as rudeness, since I have tried multiple times to develop some sort of rapport with him and barely get one word answers out of him. Whenever he stays, both he and my roommate tend to get very messy and never clean up their dirty dishes or wash out the shower. Him staying is a huge distraction for her because she puts off everything to be with him as much as possible, even forgetting to give me her electricity check until a week later. He also spends the whole day in the living room just sitting on the couch and watching Sports Center while messing around on his computer. It also is a problem because the noise interrupts me when I'm trying to study. Because my roommate doesn't have cl as early as I do, they stay up late and are very loud. Last night they woke me up at 3am because he was puking from drinking too much. She later gave me a lame apology but he never said sorry. I've attempted several times to talk about how uncomfortable I am with him staying here for so long (sometimes over a week because he just skips cles to stay here), but she always brushes it off as not being a big deal. I didn't sign up to have another roommate when we moved in and I need to find a way of letting her know just how unhappy this makes me. I like living here, but I can't stand even being in my own apartment when he stays. What should I do? Should I move out?