You were an alien, but not from Mars, you had visited it and meet this Martian, Marvin, he was nice to you and both ended up being close friends, until you had to return to your planet.

Your kind had the ability to send messages through stars, as if they were messenger pigeons, so every night, you would sent a letter in a star to Marvin, and he would keep them in his room, he really wished he could send one, but Martians didn’t had that ability.