S-Kyuu Boukensha ga Ayumu Michi - Tsuihou Sareta Shounen wa Shin no Nouryoku "Buki Master" de Sekai Saikyou ni Itaru - Vol. 1 Ch. 1.3

[Seraphus]

Uh, yeah; that's a pretty rational reaction, all things considered.

We're a team, you and me! Oh, and him. And her. And those two. And them. And now... not me.
And then sent to a known danger zone (likely by the "party leader" guy, who likely fancies himself "better-than") by the person you trusted most? The one who just tossed you aside, and said nothing in response when you threw accusations at them?

Yeah; I'd be fuckin salty, too!
I would definitely never trust any of those motherfuckers again, including the GilMas and local lord.

And gods watch over them if he finds a damn Barrett M-87...

(Which he better, honestly...)

But I get where he is, mentally; deep betrayal changes your actual brain.

 

[Seraphus]

Except the guild master knew immediately. Bet it's reasonably well known. Otherwise, there'd be people there plucking those flowers ...

I'm sure the party leader probably knew and encouraged his childhood friend to send him there; this way he can destroy any chance of them having a relationship, even if he survived, and... problem solved if he doesn't survive, right?