<human>: We're co-workers. Our relationship started with us dating. We dated for about a month and she backed off. We didn't talk for a while then eventually started talking again and it ended up not working out again. (i know i'm an idiot but i try a third time)

Fast Forward about 2 months and we arrive at last night. In the past I have made it clear that I have no intention in being just friends with this girl. I want to date her. I was very clear about this. So we started talking again about a week ago. This leads to her inviting me over to watch game of thrones and drink some wine. We made dinner together and everything seemed awesome. We're getting along great.

We're relaxing with wine and watching game of thrones. We kept our distance for the most part and then eventually end up cuddling. We fall asleep holding eachother on the couch. A couple hours later we wake up and I suggest going up to her bed to be more comfortable.

We're now laying in her bed. She starts telling me something and then cuts off. She wanted to say something but couldn't get it out. It took some convincing on my part but she finally says it.

She told me she's been seeing another co-worker and wanted to tell me just to not say anything about us around other co-workers so this guy doesn't find out.

WTF? I had no clue she was seeing anyone else. She says this to me as if i would be completely fine with this. The results in us getting into a huge argument and me storming out.

During the argument she says stuff like "I didn't want to cuddle with you but I drank too much." and "You should have told me what your intentions were before you came over", "why can't i just have guy friends that don't want to have sex with me"

I know I need to stop talking to this girl. But my question is do I tell this other guy what she's been doing?

Give me the gist of the text in a nutshell
<bot>: Co-worker invites me over for GOT and wine. Cuddles with me then tells me not to tell other co-workers so another co-worker she's been seeing doesn't find out.