If you are pushing 50 then I have to assume that she is also. A mid life re-evaluation for both of you is happening. Life is not measuring up to what you thought it would be and you haven't done what you wanted to do when you were younger. You mentioned kids. This has been her focus for sometime now and they are or starting to show indenpence from her and you. I'm in the middle of this also. The best thing I can suggest is get her and yourself involved in something outside the home away from you and the kids. Something that is her own. That way she has something else to think about.

Brenda