Its all good bro.
You had a good time for 8 months: fucking, eating, drinking, sucking, kissing, licking ... beautiful ...
And now it's all over.
Relax.
She can go and see other people and you can go and see other people.
You've still got your health, your money, and your sanity ... you may not see this right now but you are the King of the World ... Enjoy!
In 2 years time you will be in a totally different space and mindset, and she will be a girl you fondly remember