Commission of adultery by the wife is a valid defense in an action for support

Dear PAO,

My wife is claiming for support from me. To my mind, this woman must be really incredible because she demanded such right after my discovery of her infidelity to me. For a brief background, I recently discovered that she was having an affair with someone else. I am amazed by her guts in doing all of these to me. Do I have legal basis to at least refuse to grant her demand for support?