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If you are looking for a tarot card spread to find out if your partner is having an affair, then I can advise you on several online resources where you can find detailed information about this. For example, in this article https://yourmindyourbody.org/is-there-another-woman-tarot-spread/ you can find one of the very deep and informative layouts for predicting relationships in a love triangle (if it exists, of course). It seems to me that you should try this divination if you have serious suspicions that your loved one is cheating. If you have problems with reading cards, then you should visit one of the esoteric forums, where you can easily find help in this from more experienced users.