I say keep the picture. You're a beautiful girl and it puts things into context. Of course it's always easy to solve every problem for people by telling them to dump whoever it is that's making life complicated.
But I'll agree with the others saying it sounds like you're getting the brunt of being a rebound. And from a divorce no less. You'll get to play nurse, psychiatrist, care giver etc to a vast amount of hurt and insecurities that you had nothing to do with. Whether or not it's worth it is up to you - but the odds aren't on your side. I cringe when I think of what my poor GF's had to put up with when I was on the rebound.