Divorce her or change back to what I was before?

Change back to what? A street thug? Sweetheart, you can never regain your youth. You'd be an old street thug, an OG, and that is NOT hot. There's nothing more pathetic than seeing a "mature" individual trying to act 1/2 their age. So, your s/o is into young thugs. The key word here is "young". You are still a thug at heart but you're not young anymore. She's looking for a young thug to play with. If she took it anywhere else, there would be no future. You are a minority, not the majority. Most street thugs do not change their life around, further their education, and settle down. Never change down for anybody. You worked too hard to achieve what you have. You're better than that. Know your worth. Lock her up? Not quite sure what you mean by that....I'm thinking I don't want to know either. Lol! There is an eight year age difference, which doesn't sound like much but in reality....it is. If she can't hang with you mentally....she has to go. Find a real woman you can relate to, share dreams with, and grow together with. Best of luck!