Conflicted Desires At Work

I've been with my partner Alex for three years now, and we have a great relationship. We both enjoy exploring different things in the bedroom, but nothing too crazy. Lately though, I've felt this weird pull towards another coworker at the store where I work, let's call him Max. He's around thirty-five and just started here a couple of months back. Max has been super friendly to me from day one. We don't have any kind of romance or flirting going on, but there’s definitely an attraction there that neither of us has acted upon yet. The other night I was working late and Max had to cover for someone who called out sick. We were both in the backroom, sorting inventory. Something about him being so close and having this vibe between us got me really turned on. When we finished up our shift, I told him I wanted to chat over a drink after work. He agreed hesitantly, like he was surprised but also intrigued. We ended up getting drinks at the local bar down the street from my place. It wasn't too busy and it felt intimate somehow. We talked about everything except for the obvious elephant in the room, that I wanted him to be more than a friend or coworker. Max kept giving me these glances that made my heart race. Finally, when the bar was starting to empty out, he asked if we could go back to his place. It felt like an open invitation but also like there were still boundaries he needed to respect. I didn't push him on it, instead suggesting maybe we just keep things friendly and see what happens next time. The moment left me feeling conflicted and aroused at the same time. I want Alex to be happy and trust me, but this weird pull towards Max is driving me crazy. How do you explain wanting someone who isn't your partner? And how do you navigate those feelings without hurting anyone?