Just need to vent - wtf is wrong with some people.

Why would you be in contact with an ex if broke up for a month.. Makes no sense

But as for your dilemma, just move on.. She was playing you for ages if after a month has met someone new and already on holidays with him

If you havn't already, delete and block her on all social media.

She sounds like an awful piece of work. I pretend she doesn't exist from now on and wipe your head clean of her. Whatever you do, do not allow them back in after doing stuff like that. I've seen it many times before where a lad takes back his ex after they did something shady. It won't get better mate. When these people show you who they are, believe them. A friend of mine had a kid with a woman who he was on and off and on again with. Absolute nightmare for the man. Do not ever communicate with this person again.

Sounds like she was giving him a trial run before ending things with you.

Moving on is allot easier said than done, it was 'only' six months but in that time you thought you had gotten to know her, you were building up trust and learning to love someone, thats such a hard thing to do given how chaotic dating is now a days. Its an absolute mindfield. Just know that you did nothing wrong, its not your fault, her behaviour is a reflection on who she is and this new relationship wont last because of who she is, she hasnt got the emotional capacity or self awareness to make a relationship work long term. Knowing that is all well and good but you still have to deal with the emotional whiplash and the trust issues this might bring up for you. Id suggest therapy so you can talk this out with someone to help you process what happened, id also suggest you try to investigate what traits in her you might have over looked. Was she charming, confident, fun, intelligent, good looking? but in hindsight lacking in good character traits like empathy, compassion or integrity for example? How did her last relationships end? How quickly did she move on from them? You might notice there was a patten and her behaviour doesnt seem out of character from that perspective. It's just something to keep in mind moving forward so that next time you're more discerning.

Sadly, op.
People are a**holes. Not everyone… but in this world…. the majority.

Least you found out at 6 months and not 6 years. She sounds like the type of person who will do this again tho. Likely that new guy!!

I would get on with your life and thank your lucky stars.

Before you do though, if you have shared friends I would ensure to tell them all about her behaviours. Most guys, usually just suck these things up & try to move on, still secretly bearing a grudge. However, by venting a bit to your friends in common, it should help purge & deal with your righteous anger a bit, & it won't do her reputation any good at all, which is a grand bonus.

She will be outed her for the selfish, superficial, two timing tramp behaviour that she seems to be, and you will be free. And mostly you've just dodged a massive bullet, count your lucky stars you've seen her for what she is. Good luck.

delete her off and/or delete all social media- it’s completely vacant rubbish that zaps your time and self esteem. Focus on your real goals in life lie your own fitness and career. She sounds like a real empty vessel and not worth wasting your energy on anymore