Final answer:
The emotion that helps Jake stay faithful to Juanita is most likely guilt, which can act as a deterrent against betraying moral standards like marital fidelity. Alternatively, pride in his commitment and marriage could also play a role in maintaining his faithfulness.
Step-by-step explanation:
Jake and Juanita have been married for ten years. Though Jake has been tempted to have an extramarital affair, the emotion that helps keep him faithful to his wife is most likely guilt. Guilt is a powerful emotion that arises when a person believes they have violated a moral standard that they personally endorse. In the context of marriage, this moral standard is typically the commitment to be faithful to one's partner. When someone considers breaking this commitment, the prospect of feeling guilty for betraying one's spouse and oneself can deter them from acting on such temptations.
Another strong contender could be pride, as it involves feeling a sense of satisfaction in one's own or another's achievements. Jake could take pride in his marriage and his ability to stay true to his vows, which could be another emotion contributing to his fidelity.