@ Chun Hei
Can't resist this, sorry

But if I so the man I love bing shot to death, and after two years he shows up working with Al Qaeda I'd be terrified to my bones, because it will meant that Al Qaeda had him for two years - weak, wounded near death, for a man I love to work with organization like that they'll have to torture, brainwash and other ways break him for two years straight, the very thought of what he had to go trough to end up like this would make me have nightmares for years. Stockholm syndrome is not a pretty thing, especially reinforced like that for two years.
What I would do? First and foremost I'll make sure I don't loose contact with him if I can help it - as long as I know what he is doing and where he is there is a chance that I:
1. Will be able to prevent any acts of terrorism he may be involved it. If he is setting up bombs I want to know where to be able to report it in time.
2. Hopefully I'll be able to reach him and make him trust me enough to start doubting his programming". Naive I know, but I would try anyway if I loved him.
3. If I can separate him form his cell I have a chance to call in mental ward professionals (if I have a legal right), or if he is military I'd contact his people - they know what kind of mental help war prisoners and people "brainwashed" by Al Qaeda need.
In any case I'll make sure that he knows that I'm there for him, and I love him. I'd do my best to give him a reason to go back. Yes it will be painful, dangerous and most likely woun't end well, but someone I love deserves that from me - if I can't find it in my self to try to help him than it wasn't really love to begin with. You don't live people you love if they are sick, if they are mad, if they make a wrong choice - you stand by them and do you best to make it better.
So no. For me VS is nothing but a hysterical teenager in behavior.
Back on topic:
The s/s option will actually renew my interest to the character - if Shep and VS are not yet involved before Horizon I would not hold VS to the same standards, especially if they where conflicted and confused about their relationships with Shep. A friend is not obliged to stick his or her neck for Shep quite as much as a loved one. Getting together after Sheps resurrection may be a very satisfying finish for the feelings that where brewing slowly under the surface for years