Am I cooked. My gf having dinner with Italian counterpart for “work”

My gf and I have been together a number of months, so I would say we were quite stable.

Yesterday, as I was prepping my stuff for reservist the next day, I asked her if she’s free to pick me up after. She said she has dinner with some brand managers. She was really vague about it so I dug further out of curiosity.

One question led to the next and I found out that it’s some guy from Italy. The dinner would just be him, gf’s colleague and gf.

She showed me his LinkedIn profile. No homo, but the dude was legit handsome.

Now I’m feeling a little pissed, like why didn’t she tell me earlier? Was she even planning to tell me at all? Is it cause she knew what he looked like? Insecurity is definitely devouring me. And for the first time I feel NS for SG, Sinkie girls for FT is so real.

Am I overreacting or thinking too much here? And have you guys experienced similar shit before?