I'm with Jon.....I humbly suggest checking the trans fluid level.
However mine whines in reverse.....and I'm not even married but I got me a G/F.
I think any manual trans whines in reverse because of the straight cut gears. I do not believe I've ever heard any whinning in neutral but it does make some noise in neutral because the gears in 1 thru 4 are straight cut...sometimes if you listen closely you will hear the noise from the T/O bering and if you have the Pilot bearing in stead of the pilot bushing you will hear some noise...but usually it's not a whine, not like the whine from reversing.
Tom