<human>: I decided to take my girlfriend of 6 months to NYC for a weekend trip.

This afternoon she decides to make plans for later on in the night with a guy, who also happens to be an ex-boyfriend.  Said plans transpire last minute & she decides she wants me to accompany her.  Frankly, I didn't want to.  I had a long week, wanted to have a low-key dinner & call it a night to rest up for tomorrow.

She is disappointed I didn't go.  I insist that she go without me, because I don't want to hold her back from NYC (it's her first time).  I would have thought she'd stay, but her response was:  "I don't know how to navigate the city by myself".  Her response wasn't:  "I'm sorry you are tired; let's have a low-key evening".  Am I over reacting?  Any advice?

Can you provide a brief overview of the text?
<bot>: Take girlfriend on a trip to NYC; she makes plans with ex-boyfriend.  I don't want to join her, but she insists on going without me anyway.