Obviously 2, don't do it. Awaken to your own secret powers and absorb it, then maybe hand her the knife in turn?
Or, yknow, convince her to let all those ppl die anyway. You could always hold your own life hostage to make it that nice ratio of fucked up and romantic, where she has to choose between your life or 100 other peoples. Besides, if she doesn't choose yours, then it is obvious you would have killed her in vain, as she needs to love the killer (similarly, if you pick 1, then its in vain as you clearly don't love her enough to pick her over 100 strangers).
Also, isn't it kinda selfish to track him down to ask him to do it, when she could just as well have asked his parents?
Though... 3. Kiss her. would have been a nice option too, as it would make it that nice ration of sappy and romantic, where a true love's kiss fixes everything. A pokemon's tears would work in plucking the same heartstrings too.