I am going to speak to our head rabbi and have him reach out to him, gently. I don't want to turn him off from ever wanting to go to synagogue again, though. He does trust our head rabbi.
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Don't do this. It is manipulative and controlling - things he is already raising with you as problems in the marriage. You need to 180 on that type of behaviour. Speak to the rabbi about your situation for your own support and in confidence, but not as a way of getting the rabbi to persuade your husband to do what you want him to do.