Aquarias,
I don't have any advice about your medication, or for the reason behind your bad dreams. But, I wanted to let you know that I do have horrible dreams, all the time. Mine are more of the scary variety, dangerous man in my house, someone trying to hurt me or my family, etc. It feels so real at the time, and I wake up terrified and that feeling can last all day sometimes. I do believe that anxiety causes them, since before this setback, the bad dreams were not a problem for me and have only started up again since my anxiety has been worse. I suppose it is possible that your dreams are what they are...about infidelity...because you did deal with that growing up and it may be a fear of yours that you aren't even aware of, but that would only be a guess. I try to just accept that the bad dreams are going to happen for now and try not to think or worry about them too much. They are just dreams, not reality...that's what I tell myself. I hope that yours will pass quickly, I know how miserable they can be.