Hi Carole, Welcome to the forum.
Reading your story I can tell you are a caring and sensitive person. You are certainly not naïve or a fool; especially as addiction is incredibly complex, at multiple levels and emotions. In fact there are no black and white answers; however there is a lot of good advice and support contained within the forum.
In addition if you have not found this series of blogs yet, I would recommend a read and it it also gives additional links to further support for you.
Sex Addiction : a guide for couples : do I stay or leave? | The Laurel Centre