<human>: Can you give me the gist of the text in a nutshell?

I'll try to keep this short. I was in Vegas on a work trip with my girlfriend (we work together sometimes) which also happened to fall on my birthday. She had been hinting to me that she may want to have a threesome with another girl but I never really got in to it for fear of it being a "trap". Anyway, while in Vegas we talked about without speaking in code to each other and one night while we were out she kept telling me to hit on girls. I really wasn't feeling it so I convinced her to go on the prowl for another female. She strikes up a conversation with a smoking hot blonde girl and things seem to be going well. Im half involved in the conversation but I keep leaving to go gamble and give them some time. My girlfriend brings tells her what's on her mind and she's totally in to it but she's married with a kid and says she used to do stuff like this all the time but really can't anymore. Totally fine. They end up kissing and kind of touching each other (we're at some trashy club, I guess it was acceptable). We leave and go back to the hotel and have fun on our own but the next morning my girlfriend is in a mood and not happy with me. I think she realized maybe it wouldn't be a good idea for us to bring another girl home and that she really didn't want to see me have sex with another girl (she told me at one point she wanted me to). Things were just a little weird after that and we were leaving Vegas the next day. I came back to the east coast and she went on to California to see some family. It gets even more complicated but at this point we're broken up. We live together and have a dog, we kind of started a life together but things were a bit on the rocks before Vegas too. 

I'm sorry if this got a little confusing towards the end. I just had to get this story out of me.
<bot>: went to Vegas almost had a threesome with my girlfriend and another girl. Girlfriend and I mutually broke up.