Think about your wife today and who she was seven years ago. Those long-ago infidelities probably say more about her past insecurity than they say about her relationship with you. You've probably wrestled with secret sin yourself, as most men do. But you both can look back and see how much you have changed. This is a severe test of your faith.
Christians are people who forgive.
I'm fed up with it. I might just as well be single since I have to go everywhere alone anyway. This problem is prevalent among couples, and there isn't a sure-fire cure for it. But various remedies have been attempted, some with moderate success. It's immature and unrealistic to expect every experience of life to be perfectly comfortable for everyone involved.