Do you really want to be in a marriage where you have to force your wife to be with you? From the description the TS painted on his original post, it's clear to me his wife doesn't love him anymore. I'm assuming she's staying with him because of guilt or being coerced (emotionally, psychologically, socially, or financial?). I wouldn't want to be with someone who would rather be with someone else. How long can you keep this up? Until she loves you back?
Like what I've said before, if it were me I'll let her go and take my daughter with me.
If you believe they haven't slept together yet then you're being naive.