I am going to suggest that you start looking around for a lawyer. There are plenty out there that offer free consultations. Shop around now and get educated on what you can expect if he decides to file for divorce. Knowledge is power and whatever you do...do not tell him what you've learned.

Nothing says you need to retain a lawyer, but I definitely would shop around and try out some of those free consultations.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.