Armin, Eren, Mikasa and Nia were 10 years old at that time, they fled, Armin went for a moment to ask for bread, because there were lots of hungry people there too.

then he came back, he ran, carrying bread, unfortunately he only brought three, that means there must be one person who is hungry, but Armin feels bad, if Nia doesn't eat.

Armin gave one to Mikasa and one to Eren, then there was one left in his hand. He looked at Nia, he was hungry but he also knew his girl was hungry.

"Nia, there's one piece of bread left...will you eat this for me? I-I...I won't ask it from you." He looked into her eyes, he was willing not to eat as long as his girl ate.