There's not enough information here to answer your question. I will tell you that his infidelity will have little if anything to do with an alimony claim. You need to consult with an experienced family law attorney in your area to discuss the details of your case and the options available to you.
Be sure to click Best Answer if you found this helpful. Disclaimer: Please note that this response does not in any way an attorney-client relationship between Kathryn L. Hilbush and the recipient. My responses are general in nature. They do not constitute legal advice. You are advised to consult an attorney regarding this and any other legal matters.