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so this girl that ive been fucking for the last week decided to come to my dorm room uninvited....... get them in multiple long term relationships
How is She your Fuck Buddy when you guys haven't yet agreed the dynamics of your relationship ! What you kids in dorm rooms thinking ! - there is something known as managing expectations in the PUA world.
Anyways, say nothing to her. Don't try to explain anything. The next time you see her just be causal like nothing happened. Why? Because you have laid your cards and now its her choice to decide whether hse wants to stick around with you or not.
There are number of ways to save this one but I wouldn't advise you anything except for 65% push and 35% pull at this stage.