Go Slime King go!
It took me a while to remember, but wasn't this girl that one bitch that instantly snapped to blaming her team and advocating robbing our MC? She left a bad impression on me, at least.
Taking half of her share of the reward and giving it away is a total dick move on that guy's part, but the party was never going to last anyway. That guy was completely biased for that other girl and gave away money that wasn't his to give; meanwhile, Ignis is...well, kind of a bitch.
Of course, none of that is to say he should've just left her to her fate when he has an OP skill that can almost certainly help her out of it. It's just a shame we're raising a flag with this sort of person.