You could divorce, but maybe try this first . . .
Category: "Ending Relationships"
Don't you dare suffer for his art. If he wants to suffer for his art, that's fine. It's his life. You can drive him to his gigs, be his sound engineer if you want, and be his biggest fan, but he's got to take on being the damned artist.
You are an idiot. You dumped your girlfriend because you can't stand yourself, you wallow in self-pity, she feels for you, and because she feels for you, and you feel guilty about it, . . .
You will not forget your ex, but until you complete your relationship with her, it is likely to haunt you.