Goldenboy

The words of the title are what I was hit with last week and it has just destroyed me. My wife and I have been together nearly 11 years and married for 8. Our relationship has always been strong and happy, we have had ups and downs like everyone else but the downs were never serious, we have recently moved house and I just did not see this coming at all. She has recently struck up a friendship with another man from her circuit training classes who is single and whilst I'm not comfortable with this I have trusted her and given her space as she insisted he is just a friend. She say's things have not been right for a while and I think this other man has turned her head and flattered her. She has a good life and has always had what she wanted in life( love, security, help, a loving family, holidays etc) I just don't know what to do and feel as though I'm on trial and have to make her fall in love with me again. I can't believe that she would throw away everything we have built up together just like that. Please help