I didn'tromance anyone and after the final mission I was not able to call Kelly. And yes I did flirt very hard with Kelly.
Jack? If I was going to be with her I would be afraid of getting more then just my feelings hurt.
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You will find everything you need.
Good point. Liara would probably wait until the Reapers are defeated, then tear Shepard to pieces. Talk about a painful way to die!