Recurring dreams often reflect deeper emotions and unresolved issues in our waking lives. In your case, the dreams about speaking to a man you don’t recognize behind your husband’s back might symbolize feelings of dissatisfaction or unfulfilled desires in your current relationship. The fact that the conversations are flirty and sexual could represent a longing for excitement or connection that you feel is lacking.
Your husband catching you in the act and becoming angry may indicate a fear of confrontation or the anxiety that arises from your husband's past infidelity. It suggests that there may be unresolved trust issues between you two, which could be manifesting in these dreams. Your frustrations and resentments in the dreams might point to feelings of being trapped or unappreciated in your current situation.
Consider reflecting on what this man represents to you. He could symbolize qualities you find attractive or aspects of yourself that you wish to explore. It might be helpful to examine your feelings towards your husband and the state of your relationship. Open communication about your feelings and desires could help alleviate some of the tension that is surfacing in your dreams.
Ultimately, these dreams could be encouraging you to address your needs for intimacy, trust, and excitement directly with your husband, rather than seeking them elsewhere, even in the realm of dreams.