I think that your question can be subdivided into four distinct issues:
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Masturbation as an outlet of sexual frustration;
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Absence of sex in your marriage;
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Missing emotional closeness in your relationship;
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Divorce from a non Jewish wife;
These four topics have been addressed in other Jewish Values Online questions, so here I will state succinct answers and provide references to some of the relevant JVO responsa.
3. Intimacy, emotional "closeness", is the essential glue of marital relationships. You are sure to find a plethora of websites offering advice on how to increase passion and create a more vibrant and fulfilling marriage. But, assuming that you have already exhausted the avenues of self-help books and marital counselors, the next question is whether it is time for you to open a new chapter in your book of life.
In sum, the intermarriage consideration, together with your frustration, your lack of intimacy, and the absence of a close relationship, all come together pointing to a life changing time when you can strive to build a fulfilling relationship with a woman who will be your true partner and soulmate.
P.S. About soulmates, I refer you to my article on "Soulmates" published in The Encyclopedia of Love in World Religions, ABC-CLIO World Religions Project, Ed.: Dr. Yudit Kornberg Greenberg, Santa Barbara, California, et. al., November 2007, pp. 593-597.
Answered by: Rabbi Dr. Natan Ophir