When your book hits a brick wall

So I was thinking about this project I'm working on, called There Is No Happy Ending, actually, I'm thinking about this project most of the time... and what I'm thinking is. I lost it. I was SO in it and I lost it... what does one do now? It is in the hands, just now, of a reader who might breathe some life into it. But until then. I've never been one to work well on many projects at once. I think it might be time to start another. I feel guilty. But I have this idea. It's about journals and the year Kurt Cobain died. It's about the unexpected relationships that can only happen in secret... but I feel strange abandoning Jacob... can I bring him?