Feel like she does this many times throughout the series though? She gets herself into situations she really doesn't need to be in many times (and very well could have gotten her killed) due to her sense of justice.
She literally knows nothing about Inori outside of skating. Her entire reason for liking Inori is her skating potential. There's not a single chapter where she hangs out with Inori casually or talks about other stuff with her.
There's a lot more groundwork made for Rioh and Hikaru than Inori...
"she wasn't the best girlfriend, she deserves to be cheated on" sounds a lot like "the pedestrian jaywalked, its their fault if I don't stop and run them over." pure cheater cope. once a cheater, always a cheater.
I just think it's funny how his power is apparently to free any random slave in the world, and the slave he gets, rather than the more probable male worker, is a busty blond elf lady who consensually actually still wants to be a slave.