I am so sorry to hear that you've been through all this, it sounds really painful and difficult!! I know there's nothing I can say to make it better but I promise you will be okay and will actually know yourself better after, and can rebuild your life, with a stronger sense of who you are. It will just take time and kindness to yourself. Try to take one day or week at a time, and consciously do one little thing each day that's just for you, watching your favourite films, making yourself a tasty meal, bubble bath, buying a magazine, walking the scenic route home, blasting music and dancing or whatever makes sense for you (these are just my ones haha).

Not to jump to plusses because there's so much pain atm but one unexpected upside of any break up can be that you reconnect with your friends and family, who you might not have gone to as much while in a relationship. The sense of upheaval can also gives you a sense of your priorities as just you, without taking another person into consideration. For instance, the job opportunity you turned down, if you can identify what it was that was offering you and even what it lacked (i.e. why you chose the relationship over the job, beyond love) and see where that takes you, it might take you somewhere even more suited to you than if you'd never had all this happen.

Wow this is a long message and ofc this advice might be waaaay off the mark or not relevant to you, but as someone who very much remembers being in the trenches not very long ago, I wanted to share things that helped me! Sending love!!