IMHO, I don't think you should worry about it. It's your pastor just as much as hers and it's a faith thing. I wouldn't use your pastor to try and talk to W for you or anything like that, but it's hard for me to see why your W would be upset if you were talking to you pastor just for you, and not to convince her to do anything...
If your pastor talks to her, that's on him but you can even tell him not to say anything to her about it. I guess bottom line, do it because it's your faith and you want to confide in your own pastor and not to use him to talk to your wife.
ME: 28 W: 24 M: 2.5yrs T: 5yrs BD: 22 SEP 14 W Leaves: 5 OCT 14