Going off of your last answered ask, what do you think Annie could say that could make Armin cry, because honestly I'm stumped.
Hi! Long time no see, how are you?
There's honestly many things that could go wrong in a fight that could get Armin to tear up, imo. A few off the top of my head are:
Annie not confiding in Armin enough, and this making him feel excessively bad about himself
Annie simply refusing to talk it out
Annie redirecting her inner guilt and/or remorse about something, into the fight, saying hurtful things that she doesn't mean one bit, which in his anxiety, hurt him too much
In her fearful and vulnerable state, she tells him he only loves her out of guilt
Annie saying that maybe she doesn't need to rely on anybody, because she's been alone all her life, and this is like a rejection of his help
Annie telling him that being with her is a burden on him, and he doesn't need the added pressure of dealing with her difficult emotions
Annie in a fit of rage tells him that his self-loathing doesn't help their relationship
Annie simply walking out, and he gets so scared that she won't come back
Annie bringing up some tormented memory about being in the crystal that breaks him (though that's not her intention) because he's the one who forced her in there
Annie refusing his comforting touches and hugs, because of some misunderstanding or unresolved conflict, and he feels like some kind of monster for scaring her off.
And so on, and so forth xD Under the right circumstances, depending on things like how severe and bad the fight is, how much their relationship is strained, how thin or brittle the trust/faith runs, etc, Armin could break down crying for any of these reasons and more.












