Curious to hear how you would react.
Does it necessarily mean they've cheated emotionally/physically?
Is it just a reminder she has your replacement lined up?
Could it just be a platonic friend (although I would have thought she would have added this)
It means the man was operating with blinders on and she was forced to actually come out an tell you that your turn on the 'exclusive" ride is almost over. If a man hears this all he needs to do is look back and see the signs this was going to happen was coming.
If you are in an actual exclusive relationship today (God help you) your chick is going to
meet LOTS of dudes throwing their d1cks at them. If she is in any way attractive, she likely gets hit on several times a week either in person or on-line.
Could be a power play to get you committed deeper, and make you 'try' harder, or it could be you are done... truth is it really doesn't matter. If you happen to be married, go get a lawyer because you are about to be served divorce papers... now you could drag this out for a few months or years... by turning yourself into a hyper-pleasing little b1tch... but that is like fighting in quicksand.
Regardless, his response has to be the same... "So you are saying it's over, okay... I'm not going to get in your way, hope things work out for you." Then shut your mouth and listen to what she does with that. Don't cry, beg, or get angry... it's okay to show a little disappointment, but DO NOT get emotional. If she starts to back-peddle, it's a power play...
There are three things that will follow:
(1)
She wants to keep dating you, but see other people: If you are okay with this then go ahead and do it... but she loses all GF privileges, she just becomes another chick you are banging.
(2)
She wants to remain friends: If you are okay with this then go ahead and do it. I can do this, I have women I've dated and remain friends, it can be done if you have emotional self control... it's not bad, my ex-wife and I get along a lot better now then the last 3 years we were married. The problem is that too many men today just can't do this, know yourself... and understand you CAN NOT GO BACK, you are done and you are moving on. Do not operate under the assumption that you can somehow turn this around.
(3)
She is GONE: This is actually the best really... it's like ripping off a band-aide, yeah, there is the initial sting, but it's sort term. What you have to do is get all her sh1t out of your place, and get your stuff back as well... DO NOT drag this out. Do not be surprised or shocked if she has furniture that she has to move and brings along the new dude she is fvcking with his friends to help her... do not lose emotional self control... do not help her move her stuff... if an argument breaks out about who owns what, well.... decide if what she is taking is a hill you want to die on. If it is not that important or expensive let her have it, it's not worth the trouble fighting over stuff. But really, before she comes over she needs to make it CLEAR what she expects to take, put it in boxes, if it is big stuff... well, go invest in some post it notes and label them, tell her before she shows up that it she expects to take anything that is not on the list, will have to be negotiated. Figure out what you will expect in monetary compensation for anything you may have bought together and figure that out ahead of time. One more thing... if you can... do not be alone when this happens. Have a friend over when this is happening... if your friend happens to be a cop, even better. Back in my younger years when I was an idiot, I had live in GFs, really bad idea, but I digress, the first time I went through this the chick I was living with actually took my clothes... yep... that happened. Her chick 'logic' was that some of the clothes she picked out for me (never mind that I paid for them) so they were hers... To avoid this cr@p, having extra eyes watching what is going on is helpful.