And DONT talk bad about W in front of her parents! It'll all backfire, she'll find out. Show them you love her and you are commited to her, that's what parents want to see. But also don't try to get them on your side. Stay strong but let them stay neutral. Be mature. Correct me vets if I'm wrong with this.
Tell them you are committed to her, and to the marriage, but that you do have your boundaries and must protect yourself. That you love her, you DON'T want a divorce, but you also won't wait forever.
Ask them to support neither you nor her individually, but to support THE MARRIAGE.