Help with girlfriend cheating

Ask her in such a way to that she dosen't feel bad.
Also tell her what are the consequence and express your love.
I am sure she will come back to you.

She is having an affair.. How can I stay with her... Especially after them. Probably have sex

She has been seeing him behind my back and msging/calling him everyday.

Do you have PROOF or is this what you think, just because she has her old boss' phone number?

This relationship was OVER the minute you began to sneak around and look in her phone.

Yes.. She has a friends name in her phone with a love heart at the end of her name .. And she added the bosses name under the same name except without a love heart.. I asked once who it was and she said it was the friend with the love heart at the end of her name.. I seen a photo in her phone when he msged get and said don't msg my phone my friend is using your phone.. I also seen that she has been calling him after she msged me on her way to work for long periods of time and when I have gotten home from night shift before there has been missed calls from that number late at night..

Listen...all that sucks but can you smell the coffee? Life is too damned short to be abused and cheated on. Ask her to leave.

I'm so angry though I haven't approached her about it yet...

You need to get some frank answers from your GF. If she thinks it would be better to string you along for the holidays, because she thinks it's nicer, get out now. I'd rather be alone than alone with another person waiting and watching her checking to see if married with 2 kids Prince Charming gets around to checking in for half a mo. Please don't be her safe haven, while she waits for married man to tell his wife and kids (he will delay this as long as his wife doesn't catch on) that daddy just found Cinderella, and the others will just have to bugger off.

She is making very poor choices, don't let her involve you in her tangled selfish choices.

Thanks glitterbag, I just don't know how to approach her about it.. What to say.. I'm so upset.. I want to know how long it's been going on for...

'She has been seeing him behind my back and msging/calling him everyday. '

How do you know about 'seeing' him?

And do not wait any longer, tell her we need to talk and tell her all of you wrote here. Good luck!