So ... was Axel telling him he'd always been attracted to guys or what? Wolf wasn't interested in meddling in his brother's love life (at the moment, anyway), so he wasn't focused on Axel admitting he'd liked Gio forever, but the implication behind it was that his brother was gay - or at least bisexual, even if he'd only liked another guy.
"Why'd you keep it from me?" Wolf met Axel's eyes as he spoke, though his gaze soon dropped to look for the answer. "You know you don't need to pretend to be something you're not with me."