The reason your best friend is your best friend is because you do NOT live with them. Do you know why people get divorced? Because they live together. There is a point where humans get comfortable in their living space and start leaving dirty underwear in pantries and blasting bad music at times where no reasonable human should be awake. You do not want to wake up, roll over, and see your best friend in the bunk bed across the room, eating your chips and using your headphones. Keep the friendship alive and continue living with the university-assigned randoms.