Contact your insurance and tell them the story. They will then contact his insurance and the two insurance companies will work it out. You usually do not need to do anything except tell your story.
Mr. Kenchan is right when he says to get all your roomate's information (DL number, insurance, etc.)
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Koni|Swift|Michelin|Motordyne|Berk|RJM Performance|Gates|SPL|Motul|Technafit|Ate Super Blue|Hawk
Tommy Kaira|Momo|Optima|Hella|Hotchkis|Red Line|ZSpeed|Stillen|B&M|H&R
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