system
devastated: she went behind my back to return her ex's t-shirt. Lied about it. I found out through her facebook messages
human
my instincts are never wrong. I found out her lies when I checked her facebook chat history. 
gpt
So, what was she lying to you about?
human
she arranged to meet up with her ex to return his t-shirt! why do that behind my back? we had just started seeing each other. Made me so mad
gpt
Oh, she shouldn't have done that