Since you need to have been a permanent resident for 3 years before you can apply for citizenship and the citizenship application process itself can take months, the divorce will jeopardize your status. To get citizenship through her you need to be married to her for another 18 months or so. Do you realize that?

Have you tried marriage counseling?

If nothing else works, TPS is always there but the deadline for application is coming soon. So, you need to make up your mind soon.