So heres the situation..

I had been seeing this girl for around 6 months and got a job offer in a different city. In a snap decision I broke up with her and told her it was going to be too difficult, I almost immediatley regretted it and after a few weeks of deliberating I asked her if she wanted to try and make it work, which she did.

Now heres the issue, whilst we were split up, she kissed another guy from work on a night out. She then started texting him etc and she got invited on holiday with him and another guy friend which she accepted. She continued to text him whilst we were trying to sort things out and it took her around 2 weeks and me forcing the issue for her to text him and tell him she didnt want anything more than friendship. She claimed she didnt want to make things awkward for the holiday..yeh right! She has decided to still go on the holiday with them both and has told me that she loves me and doesnt want to be with anyone else and I know that she does genuinely mean that and that she was acting out of character during the break up due to insecurity.

However, of course this guy is going to have a week to try and tempt her arm and I am unsure how to play it?

These are the main questions you should ask yourself.
If you want to be in a functioning relationship with her,shouldn't there be mutual trust?
BUT
If you don't trust her,do you think you should keep going on with the relationship?

Or you could try and go with her to be able to keep check.
And if she brings up the matter of trust just say something like "Don't you want me to have fun holidays as well?"
Hope this helps
:)

Your sorta fucked here, it all depends on how YOU play it.

Yes he will try very very hard to fuck her

But remember you broke it off with HER, and gave her the options to do as she pleases.

So, making a big deal out of it will just make it worse.

The truth is the one that cares the least wins!

Make sure you will have other options while she is gone, and that she knows this!

Screw her brains out before she leaves, instill missing you in her mind, even before she leaves!

Don't badger her with a million questions, don't call and text a million times the minute she leaves.

Set up something to do!

Like going out to your favorite pick up club with your best wing!

Good luck Bro!

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They call me the cat whisperer, cause I know exactly what the pussy needs.

Thanks for the advice! So my best shot is to ignore it and play it cool I guess? She knows its gunna bug me and has tried to reassure me but it just pisses me off that hes with her thinking something will happen.

Women feed off emotion, drama causes lots of different emotions, guilt, anger, possible pleasure. ect.

Turn on the switch that makes her miss you emotionally!

You are not easy to keep, you are the prize!

Abundance is in YOUR favor, you can go fuck who ever you want if she is not there to prevent it!!

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They call me the cat whisperer, cause I know exactly what the pussy needs.

Great advice. Any tips on particular ways to achieve this?