yeah. basically, after nimona, he realized he finally got his foot in hollywood and wants to pursue that, because that's what he's actually passionate about.
it's not surprising in the slightest. even before ned left, eugene was barely present. most content was ned, keith and zack, and i think he's been wanting out for a long time, just never had the break that allowed him to do it, and he didn't want to be the zayn malik(leaving the group and being blamed for things to go south afterwards causing them to split for good). there's a "conspiracy" that the reason eugene was so pissed about the ned situation wasn't so much because of what ned did, but because it meant eugene now had to be more involved in the try guys and couldn't leave just yet. and then he basically waited for things to somewhat calm down to finally make his exit