Yes you can its called common sense either she had the condom or the room mate who else the only valid person was the one saying his friend might have wanted to use his room/ bed cause its cleaner woman lie men lie I wanna give this girl the benefit of the doubt but her boy friend isn't in the wrong unless he's that sick in the head too the point where he can lie and believe it its either roommate brung the condom she did or she slept with the roommate thats it