A woman wants a man who is thoughtful and compassionate - when necessary.
Being the strong, intellectual alpha dog will only get you so far. You need to pay attention to her when she talks and take note when she is feeling down. It is important to pay attention to her, otherwise, some other guy will, and he will end up taking your place.
Just try to avoid the word "crazy"
With that said, women have far more emotions than men - most of these emotions being completely unnecessary. So every now and then, you will notice that she is acting completely insane and you might feel the need to tell her that she is being crazy. You might be surprised to learn that you can do this - just try to avoid the word "crazy".
If you "put her in her place" from time to time, she will see you as a real man, rather than a mushy guy who will undoubtedly end up being friend-zoned. But remember to be thoughtful - even jerks only get so far.