I think you're kinds in a tough spot here. I don't think he is actively going to pursue a divorce but I don't think he is going to commit to the marriage either. I think he has no problem living and keeping you in limbo. If something better comes along he can say I told you I wasn't happy.
I lived in limbo for 2 years and it is not a pleasant experience.
It's up to you to decide when you've had enough.
You're early in the process so just keep doing what you're doing just don't expect changes anytime soon.
