Advice: Give each other space. You will be tempted not to, because you have so many opportunities to be close. Make sure you do not spend too much of your free time on each other. You will both grow to resent it. Additionally, avoid being a jerk. If she's well and truly crazy, there may be nothing you can do, but most people are fairly reasonable, and will not hate you forever if you are not a jerk. Your relationship may end up not working out, but you'll still be able to live near each other. If she turns out to be a jerk, try to be polite after your breakup. If she turns out to be psycho, get some help from your RA and your friends.

Also, use protection. Good protection.