Tobias stood in the cemetery in which Tris was buried in. He stood over her grave with tears in his eyes, even though he wasn't the crying type. His cheeks were tear stained, and he had bags under his eyes, his eyes were bloodshot and red-rimmed from endless nights of crying himself to sleep. He looked down at the cobblestone slab that had 'Beatrice "Tris" Prior" written on it.
He chuckled when he read the name, Beatrice. He always thought it was so adorable, the way the name rolled off of his tongue, a name that belonged to a person he once thought he could spend the rest of his life with. But he couldn't, because the love of his life is dead. Tobias knelt down on one knee, the sweater he let Tris wear the first time she ever slept over, the night he saved her from almost getting thrown into the Chasm, lay wrapped in his hand.
He couldn't help but cringe at the memory. The memory itself made him tear up again. "Remember all the pointless arguments you and I had, about you risking your life?" Tobias says, his voice breaking on some of the words. "I realize now, how stupid and inconsiderate I was to hurt you, and accuse you, you were just being the selfless Abnegation girl that I fell in love with. Thinking about everyone but yourself."
Tobias touched the tips of his fingers against Tris' tombstone, and traced the letters of her nickname "Tris," the name was beautiful, and he loved the memories that the name itself possessed. Tobias looks down at the black sweater he held in his hand, he hadn't worn it since the day he let Tris.
"I love you, Tris, and living a life without you is hard." He looks down at the artificial black roses someone had left on her grave. They meant death. "I can't do it Tris. . . not anymore. Not without you."
Tobias unravels the sweatshirt, and a gun falls into the snow, he places the sweatshirt on top of the tombstone fixing so it doesn't fall off. Then he picks up the gun and whispers, "You die, I die." He places the gun to his head right on his temple. He places his finger on the trigger, and without a second thought, he pulled the trigger.
His lifeless body fell flaccid on the ground. Though suicide was considered cowardice, he didn't care. Because finally, he was reunited with his beloved Tris. The love of his life, the object of his affection. Their lips met in a long-awaited kiss and for awhile they just held each other. Basking in each others presence, just happy to be reunited.