Help with younger male Scorpio

I’m fighting a battle with myself over a younger male Scorpio at work. I’m staying away as he has a girlfriend. He pursued me and I found out he has a gf afterwards. I’m struggling a bit as he’s in my head. I won’t tolerate any nonsense from him though. I can’t talk with him easily as we are at work but I really want to tell. Him off for pursuing me when he’s attached ( it’s not a stable relationship with his gf)

I dislike dishonesty. Unfortunately I have to remain professional. We catch each other’s eyes even though I try not to look at him . I hate feeling like this it’s the emotional attachment ugh! ....any help appreciated.

Sorry I think I posted before finishing the message. I have developed feelings for this guy how do I cut them off ? .....