1. Take all her pictures, notes, or anything that reminds you of her and go to some sketchy area of London like Kings Cross and burn that shit. Say goodbye and walk away. Leave the ashes laying there in a spot you would never have a reason to visit.....like Kings Cross

(bad memories there)
2. Wake up early and go get some jobs. Get anything you can to make money.
3. Find a place where you can sleep cheap so will be some sort of flat share with multiple people.
4. Spend an few hours each day dedicated to creating an income stream outside of your jobs. As you make more and more money then start quitting your jobs.
5. Date a female with a soul.
I have been in similar positions I think twice in my life when I was broken hearted and with hardly any money. You just need to get out there and do it.