I think it really speaks to your character that you're willing to consider ways in which your existing relationship can be made to work for you and your wife. Are the emotional problems between you and your wife recent developments, or is this more of a chronic, long-term problem?
If you can identify particular ways in which your wife is not meeting your needs, then I think being open with her and letting her know about them would be the best thing to do. If you want your marriage to work, then both you and her each need to be working to make sure that the other is happy.
Hopefully you and your wife can come to an agreement about what isn't working, whether it can be fixed, and if not, what needs to change in your relationship.
Best of luck!