I'm 25 and have $1 million. My wife (33F) has $400k in student loans. How do I make sure my money stays mine in case of a divorce?

I'm 25 and have about $1 million, about half of that is in_before tax 401k. The rest is half (100k) in cash, 150k in after-tax brokerage, and 100k in real-estate/REITs. My income is about 250k/yr and I save on average about 100k/yr.<br><br>I am engaged to a woman, "Anna". She is an anesthesiologist, and has about $400k in student loans. She pays about $2.5k/mo to her loans which is about 25% of her income. I do not want to help her pay off the loan, as we aren't married.<br><br>Anna makes about 500k/yr and so far, has saved about 100k in her 401k (she does not contribute to anything else).<br><br>I am afraid that if we get married, she will realize she can live a more comfortable life off of my savings than she can alone, and we will divorce and I'll be on the hook for half of my savings, which would completely set back my FIRE plans (I hope to retire at 45).<br><br>What are some legal documents I can draw up to make sure that, in the case of a divorce, my money will remain mine? Or should I just not get married and break up with her?<br><br>&#x200B;