When you go to college, everyone always tells you to never room with your best friend. So, I did random assignment my first year and there were no issues. Everything was fine. We never became super close or anything, but it's not like we didn't like each other. It was simple. I always felt like I was missing out on that part of college where you and your roommate are super close. It didn't bother me until I found my best friend at college. We would be hanging out in her room until 2:00 a.m. doing homework and talking, and I'd be wishing that I just had my own bed so that I wouldn't have to walk across campus. So, we decided to be roommates this upcoming year and I couldn't be more excited.
I think that there's a major difference in rooming with your high school best friend and your college best friend. In high school, you guys aren't always with each other, so, when you end up living together and having to interact all the time, it can be stressful. However, when you have a best friend in college, you are constantly meeting up with them at the library or for dinner and then hanging out after all of that to relax. When you are best friends in college, you're usually attached at the hip: never see one without the other. So, when you move in together, you are more than comfortable with the large amount of time that you'll be spending together.
Also, when you're best friends, you probably have some of the same taste in food, music, books, etc. You are going to be able to tolerate one another a lot more if you have similar interests and thinking processes. Being able to think as a unit is important when living together, because you can't change the way things work in the room on your own. The more you two are able to think on the same wave length, the better.
Then there's that level of comfort you have with your best friend where you may not feel weird sleeping in just your underwear and a t-shirt or feel like you have to go into another room while changing. You don't feel so vulnerable with them. You can be as ridiculous and as crazy as you want, because that's what they love you for and will probably even join you.
Another great thing about having your best friend as your roommate is being able to have a therapist about 20 feet away at all times. College is stressful for a lot of people, so it's helpful to have someone to vent to when needed. Being able to feel open with one another is also very important. because communication is key! You'll never feel like you can't be honest with them if you keep that in mind.
Now, every friendship is different. Not all college best friends can be roommates, because maybe you guys like your space and don't want to be together all the time and like how things are currently. I'm honestly so excited to be moving in with my best friend. I can't wait to share food and have adventures with her. I'm excited to have the experience of living with someone of my choice, because I wouldn't want to do it with anyone else.