Yes and no, he knows it could go south easily but I don't think he realizes how easily it could happen. For instance, I think the wrong reaction to Acedia going "YOU'RE NICE TO ME BECAUSE IT'S CONVENIENT TO YOU" could have send their relationship to hell, but Souya didn't think about it, he's aware that if he stops being trustworthy/doing what he says he'll do Acedia will stop trusting him, but he doesn't think about it every step of the way 'cause he doesn't think he has to.

Though he's totally aware Acedia might try to cut ties off in a temper tantrum to have an excuse to go cut people.