A note from me xD: I'm SO sorry all of you Martha adorers out there for this chapter. I just thought it may add a little something to the story if Martha was jealous. Only a little though. I will try my best not to emphasize too much.
"Martha! Where are you going!? Slow down!" The Doctor yelled loudly after Martha.
Martha hunched over her back and continued walking, looking down at the pavement beneath her feet.
"Oh, so now you care." She thought a little crossly.
She built up her speed when she heard a second pair of footsteps coming after her.
"I thought this 'Rose' was in a parallel universe? How could she be here? Unless this is a parallel universe..."
She stopped, suddenly observing her surroundings.
It seemed like a London street.
A little grungy in places, but still a totally ordinary street.
She was suddenly aware of the Doctor standing behind her.
She turned around, her arms tightening.
Her eyes suddenly caught the Doctors hand.
Holding 'hers'.
She swallowed a little, and then slightly eased the pressure on her arms.
The Doctor opened his mouth to say something, but Martha interrupted before he had begun.
"I'm sorry. I didn't want to ruin the moment." She said cuttingly.
She didn't know why she was acting the way she was.
She just thought the Doctor... What did it matter..? She could see that the Doctor and this 'Rose' were close.
A little too close for her liking.
Why was she thinking things like this? She didn't even know Rose. Who was she to judge?
Martha took a deep breath.
"Look, I understand." She looked at the Doctor and Rose in turn.
"I'm going to take a look around London. I'll meet you later in there."
She pointed at a cosy looking cafe over the road. "2.00, Okay? Have fun." She said bluntly, before walking off.
"Look at it this way Martha," She told herself reassuringly.
"A whole day of shopping around London without aliens around every corner!" She smiled, and continued walking down the street, clearing her mind.