He fell for Chase as a child when Chase used to dress up as a girl and have child actor roles that were girls. That's what he means when he says he was surprised that his first love was a guy. It's because he thought Chase was a girl as a child.
I'm pretty sure this has already been covered in earlier chapters.
Josh was straight, a top, a womanizer. He was like that before he manifested as an omega and continued like that afterwards. Chase is the only exception, his first love and the only male.
Dane ( he doesn't care if female, male, alpha, omega, or beta) and him were both tops, they never had sex with each other, but at the same location...so they know a lot about each other.lol
SPOILER!! (Coz I remember some of this info is in the side stories)
.
.
.
.
.
.
.
.
.
.
.
I think it's mentioned in earlier chaps that Emma said "The girl Josh is with/kissing in the morning is different when it was afternoon" so y'know, he a playboy even during his highschool days... In the side stories Emma said his longest relationship is 2 months only, Josh insisted it's 3 months... And yes unlike Dane, who's never picky with his sex partners, Josh only dated/had sex with women! Chase was the only guy he's had sex with

I’m kind of confused or maybe I had the wrong impression. What is Joshua’s dating history, he was surprised his first love was a guy, was he straight then? But I also so a spoiler he was freaky and had orgies with that other omega. Was he a top or bottom.