Should I Be Upset?

Sooooo, my fiance and I have been arguing the past few days about him lying about the age and looks of the human resource lady at his job. He's a maintenance mechanic for a saw mill and its basically just males but for the past 2 months all i kept hearing was how this HR woman( *not saying name, so S will be her name* ) is always standing up for him and defending him so im like hmmmm i said how old is she, he said shes an older lady and he was like she not cute and stuff but kept giggling so i knew then some wont right. Ofcourse, me, i did some digging! Shes pretty, young, and a big butt and stuff... im mainly mad bc he lied and yes, due to past events my self esteem is a little low and i do feel like im not pretty enough.. well thats neither here nor there, BUT am i wrong for being mad?? If i am, I'll deal with it. But geez, I hate a liar😑😞😞

For all who has opinions on my self esteem - I've never mentioned to him how i feel low on myself , ive never told anyone about that issue. I was raped and abused by my uncle at a young age and i know that plays a small part but as far as how i feel abt myself, no-one knows! So stop being so inconsiderate with the "he cant win" comments . A lie is a lie bc if i did that all hell would have broke loose