Good for you! That's looking out for your interests, which only you can do for you. Knowledge is power.

Keep up your connections with people outside the marriage. Never let yourself get trapped into only being with him.

When you finish your academic program and start working full-time on your career, I think it will become clearer to you what you need to do about your marriage. Only you can decide. Just be sure and protect yourself, as you go along. Seeing a lawyer was a good start.