Abandoned.
That's a feeling that always stayed with him.
Fiat was always waiting for the moment Leo and his family would realize that Fiat wasn't good and would also abandon him like Fiat's own family did.
Whenever he committed the simplest mistake, he always had the feeling that the mistake he just made would be the reason why he was going to be abandoned once more.
And when that woman, that one that called herself his mother but all the memories with her were hurtful, came back that feeling became even stronger to the point Fiat wanted to push everyone away so he wouldn't be that hurt when they abandoned him.
Thankfully he had someone who was there to tell him that he had people who loved him and would never abandon him.
Tho had always been good at knowing when Fiat needed reassurance even if they weren't as close as the others.
Whenever he noticed it, he would just say that the two had to go grab something and take him to a quiet but secluded place to reassure Fiat.
"You have people who love you, Fiat" Tho says hugging Fiat "And we will never abandon you no matter what" he adds and plays with Fiat's hair while Fiat just melts into his arms and let Tho's reassurances calm down the monsters in his head
Leo may be the one always there and the one Fiat loves, but Fiat would always be thankful to have Tho there to reassure him when the monster in his mind was winning and no one realized it except for Tho.
