If Liara does happen to be in ME2:

What if Liara is a crew member but breaks up with you? Will you be a sad, lovesopped mess, or date someone else?
What if you can date Liara and another crew member at the same time? Will you stay solo or go for it all?
What if it's possible to date another crew member, then after the end break up with them and hook back up with Liara? Will you have a fling or remain loyal until the end?
What if you do like someone else better, but then Liara won't let you break up with her because you dated her in ME1?!