Solitude

He'd been on this planet for nine months now, completely alone.
That's why he'd signed up to become an astronaut. He just wanted to be by himself.
He'd travelled out here as part of a team of six. It had taken almost a year to get there. Once everything was set up, the other five had buggered off and he was quite glad.
He'd "accidentally" disabled all means of communication pretty much immediately. They couldn't see what he was doing and none of the data they hoped to gain had been recorded. He'd just shut it all down and lived alone, peacefully.
There was a roar. He stood in front of the base that was his home and looked to the sky. Two crafts were approaching.
He always knew this day would come. Still, he's had a blissful nine months.
He went inside and took a gun from its hiding place - although it was a mystery who he'd hidden it from.
He swallowed a bullet.