Things I would try:
1.) Get back into your program, make some massive changes in your physique. Keep what you can at work; good idea. In the past; my lifestyle has inspired a few girls that I have dated to go to the gym. My current girlfriend is ALL about training now; and I didn't say a word. She just saw how serious I was and how much fun I have and wanted in.
2.) Use wiki and google to your advantage my friend. If your planning on a supplement...look up some studies that show how great they are. She should read these things and THEN form her opinion.
3.) Ditch all supplements and just go for it without any. You can make good gains with just eating healthy; I have only used fish oil in the last 3-4mo and have done quite well.
I too; think there is more to it then just suppelements. It seems to me that it's time for a deep talk with the wifey about what is REALLY going on.
She might have seen you doing so well and thought that she could never do it; and didn't want you to go well.
It is proven that women tend to end up with men that are less attractive then themselves; in order to appear to be the more attractive person in the relationship. That's why you see a lot of fartknockers with hotties.
Hope all goes well man.