What should the title of my story be?

My story is about a girl who falls in love with a guy who has a disability, he can't walk and has a rare disease, a few months later after the marriage, he dies. The girl read in the notebook that the guy wrote in and it said "I'm sorry that I couldn't protect you". The girl becomes a super star, sees the ghost of her loved one, followers it and opens a door to a whole different world (Like a dead garden world) the guy turns into a blue butterfly and she continues to follow it, at last he turns back into human and he gives back the promise ring. She is suddenly back into reality and ends up wearing both rings, and I'll think of the rest later