<human>: Summarize the given text in a few sentences.

Please reddit I need advice

Ok so my GF of two years and I just got back together after taking a "break" for about a month. 
During our "break" there was a guy at work that she was talking to that even though she called him handsome said she was not interested in. 

I would press her every now and then and bring the guy up even though I knew it would cause problems. 
Once we got back together she informed the guy that we were back together and then two weeks later mentioned that they hadnt spoke or instant messaged each other since. 

Fast forward a week or so later and she had sent me a text informing me that she had gone to lunch with some of her girlfriends from work and that they had ran into the guy while at the food court. She said it was nothing to worry about. I told her thanks for the heads up and was he invited?  
She then got upset and called me and told me that i shouldnt be so insecure and that even though he was there , he was with a girl. 

Fast forward to today and one of the girls who she went to lunch with told me just while making small talk that the guy was alone and even though he wasnt invited he still ate with them.

I need advice. Do I confront her about the lie or was she just lying to me as a way to pacify me and that the blame belongs to me and my insecurities?
<bot>: Caught my girlfriend in a lie about a lunch date she had with some co-workers including a guy who like her!