4 Times
Four Times the Master got jealous and One Time when he finally did something about it
1.
The Master hated Earth.
The Master hated politics.
Being the Prime Minister of one of Earth's countries probably wasn't the best idea.
He had been waiting patiently - well as patiently as the Master could - for the Doctor to return from the end of the universe. In the meantime, he allowed himself to enjoy humiliating, torturing and killing the human politicians who either annoyed him or stood in his way.
His whole plan was carefully laid out, he had gone to so much detail to make sure that this plan succeeded that he was sure the Doctor wouldn't be able to stop him this time.
One important part of the plan was infiltrating Torchwood; this was how he was able to see what was happening inside Torchwood Tower as the Daleks and Cybermen invaded the Earth. He knew everything was safe when he caught sight of the Doctor, waving a piece of paper on a stick with an amused smile on her face. The Master was glad to see that some things hadn't changed.
He watched as much as he could - Torchwood had a limited number of security camera that the Master could hack into - with a smirk. That smirk only faded at the end.
He watched as the Doctor sent away the boy - in Time Lord and human standards - and watched as he returned. The Master sneered when he saw the smile on the Doctor's face as the boy turned away. Once upon a time, he made her smile like that.
He watched with some satisfaction as the boy slipped, trying to move the lever which would remove all of the Daleks and Cybermen. Unfortunately, he was saved but the universe was sealed off again and the Master watched with heavy hearts as the Doctor leaned against the wall, as though she could hear her lost companion.
He frowned when she turned and left Torchwood.
Why was he feeling this way?
2.
The Master was sat in the console room of the Doctor's TARDIS, sneering at the emotional display the Doctor and her newest stray - companion, whatever - were giving him.
Mark Jones had assisted the Doctor and the immortal freak in bringing his downfall and he was glad to see him go. The Doctor, on the other hand, didn't share those feelings and he rolled his eyes when she threw herself at the man in a hug. Even he could see that he enjoyed the hug far too much than he should have.
He was glad when he turned away and gave a huge sigh when he turned back, earning a glare from the Doctor. He then had to listen to the human explain his feelings and watched the realization dawn on the Doctor's face as he explained in great detail about his obviously unrequited feelings.
When the human finally left, the Master stood and walked closer to the Doctor, confused about why she hadn't moved yet. He stepped back when he heard the Doctor sniff lightly, so lightly he would've missed it had he not walked towards her. She had obviously not noticed him - her eyes were stuck on the door her companion had just left out of - so he walked back to where he was stood, just in time as the Doctor turned around with a grin on her face.
"Just the two of us then! Allons-y!" She cheers and the Master rolls his eyes at her latest catchphrase but still felt upset at the sight of the pain in her eyes. The wide and dark eyes which seemed much darker to his eyes as they were filled with grief and death, so much death that the Master was almost jealous. Almost.
He was mostly worried about the Doctor. And then there was something else he couldn't place.
He was probably just tired. It had been a long day after all.
3.
The Master hated lots of people, liked only a handful and loved even less. He was included in all three categories. So was the Doctor.
However, he knew exactly where to place Professor River Song.
Ever since they had met River, the Master had constantly been on edge. River seemed too close to the Doctor for the Master's liking.
When the Master looked at the Doctor, he was reminded of his Academy days; admiring the Doctor from a distance, all he needed was the Rani laughing in his ear and he would believe that he was sixteen again! Barely even a Time Lord.
As he watched the Doctor staring at River's back he frowned and could swear he felt one of his hearts breaking. The scene was familiar; watching the Doctor watch other people and feeling... Jealous.
Not that he would ever tell the Doctor that. She'd never let him hear the end of it.
4.
The Master glared at Ross Tyler who was smiling at the Doctor.
A smile that she fully returned.
And the Master felt his hearts break.
She never did smile at him like that.
Not in a long time.
And One Time when he finally did something about it
They were doing it again.
Alec Pond had only been with them for a matter of hours but the Master watched as he and the Doctor flirted as if they were alone.
Some things never change, the Master thinks as he watches the human make fun of her bow tie, even going as far as to pull it slightly, pulling her towards him.
And then the Master decided that enough was enough. He stepped forwards towards them and crosses his arms with a glare, trying his best to be intimidating. None of them found it scary if their badly concealed laughter gave any hint.
"Would you two please stop flirting?" He asks through gritted teeth and Alec raises an eyebrow as the Doctor looks confused and just a little flushed and her hand came up to self consciously brush against her bow tie as a distraction from the Master.
"Why, are you jealous?" The human smirked and it was the Master's turn to raise an eyebrow.
"Perhaps," He reluctantly mutters and Alec bit his tongue to stop his laughter.
The Doctor's grin, however, made the painful admission just a little less painful.