To Jack? [It sounds ludicrous, but then, Martha's first meeting with Jack involved mouth to mouth resuscitation, and she was a bit of a flirt herself when she wanted to be. So Jack wasn't much of a threat.]
If he sees you really aren't interested, he'll probably leave you alone. [Provided his 51st century pheromones don't kick in. She won't tell you about those Sam. You're already freaked out enough as it is.]
Besides, you have Elena, so that'll... probably make him stay away. Is she here?
[Yes, Martha will blunder right into that as she has no clue that they sort of aren't together anymore.]