Signs of potential infidelity in a husband can include changes in behavior, increased secrecy, sudden attentiveness to personal appearance, unexplained absences, and a decline in intimacy. However, these signs can also have other explanations, and jumping to conclusions without concrete evidence can be detrimental. Open and honest communication is key; if you have concerns, consider discussing them with your husband in a calm and non-accusatory manner. If suspicions persist, seeking professional advice or couples counseling may be beneficial.