I think fiancée fancies woman at work

Argh I dont know why I've been getting so jealous. I have never been that jealous, ive been ok with porn and previous partners working with loads of women but with my fiancée now I feel so jealous. I stupidly asked my fiancée what the new woman at work is like. He decribed her as attrative looking slim long hair young. So I asked if he flirts with her he said no hes too professional. I suppose ive shot myself in the foot I shouldn't of asked. I wanted him to say he wouldn't flirt with this woman because hes with me! Hes a really good looking guy and id say im just average. Im at home with kids all day and hes off to work with these women. My f has lied a few times about women from his past and he always goes on how he doesnt even look at good looking women ( we all know that's rubbish! ) why with him do I feel so bad. Exs have gone drinking with good looking women and ive never even thought twice, would love some help

He's your fiance. You have every right to be concerned. He's lied in the past I be a little more concerned after knowing that.. honestly I would just try to be straight up with him and ask him what's going on