There will be points in the games where certain companions (or a group of companions you select) branch off and accomplish side missions. The effect is intended to be like the sequence on the Death Star in Episode IV, where Luke, Obi-Wan, and the Droids all go about seperate missions, then reunite later on
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I don't like to lock CNPC quest down to romance quests - it's more like we have relationship quests in K2, which aren't tied solely to romance but how much you are an example to your allies and how you treat them. Things like building friendships, loyalties, developing grudging respect or contempt, and occasionally the need to strangle the life out of each other will occur. And you can cheerfully shut them all down and ignore them if you want, though your companions may occasionally lay into each other without prompting.
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Actually, you don't go in search of your lightsaber because it hasn't been lost - when you get exiled from the Jedi Order, they just don't let you keep your lightsaber. Sure, you could make a new one. But you're right, yours is special and worth reclaiming... if you choose to.​