#Toshiro isn't a bad person. He has communication issues and makes very bad decisions based on his own refusal to communicate.

[xenodile]

"Shuro loves Falin for the same reasons he hates Laios" Completely and utterly wrong, could not be further off base.

I get the impression a lot of people watching Dungeon Meshi as it airs, or are a bit removed from its original manga run, have forgotten that Laios and Falin being monster freaks wasn't actually apparent until the events of the story. The only person that knew Falin loved monsters as much as Laios was Marcille because they were best friends at school.

Once Laios and Falin were in an adventuring party together, they both had public facing personas because they had both learned through their separate upbringings that being super interested in monsters and dungeons wasn't normal. Laios is the blunt but well meaning, outspoken and opinionated guy we all know, but Falin was way more withdrawn and soft-spoken, non-confrontational, easy to get along with. Everyone that interacted with Falin would say she's a sweet, gentle girl that everyone likes. Because she was, frankly, kind of a doormat.

The whole thing with Toshiro's infatuation with Falin is he doesn't actually know her. She is outwardly very polite and reserved, and that appeals to Toshiro because it meshes with his cultural sensibilities and how he was taught people are supposed to behave. Then he sees her marveling at a caterpillar in a private moment and decides on the spot that she's the ideal woman and proposes without actually talking to or getting to know her.

And his lack of understanding of Falin as a person is brought to the forefront in every action he takes after she gets eaten. He leaves the party and makes no attempt to contact the two people that Falin loves the most. Whether it's a matter of him just not knowing how much Falin cares about her brother and Marcille, or actively avoiding Laios to rescue Falin himself, he's demonstrating that he doesn't actually know what's important to her or understand how she feels.

Then when he meets Laios's party on the lower floors and they go over what happened, it's made even more blatant that Toshiro's affection is shallow and half-baked. He came into the dungeon a week too late and neglected his health the whole way down, so he was in no state to actually try and save Falin when he got there. When Laios talks about eating monsters, something Falin was thrilled about, Toshiro is disgusted. He threatens to kill Laios and turn Marcille in, which would never fly with Falin. His anger at the use of black magic is entirely based in his selfish idea of Falin being tainted and blaming Laios and Marcille for "ruining" his attempt to rescue her, as Kabru points out that Toshiro would have done the exact same thing in their shoes and that he's being a hypocrite. To say nothing of how he'd rather kill Falin after she's been transformed and "put her to rest" rather than put any effort into saving her, because that would require further involvement from Laios and Marcille and methods that Toshiro doesn't approve of.

And there's the fight he has with Laios, and Toshiro's subsequent confession that he had hoped to just take Falin home with him. He at no point gives consideration to what Falin feels or what she might want, only what he has decided about her based on the most surface level observation. Just like how his problem with Laios arises from his refusal to just talk to him about his boundaries, he has no actual connection with the woman he claims to love because he just wouldn't actually talk to her.

Like it's not a coincidence that every time his attraction to Falin is brought up, another character goes "yeah he's being weird about it".