I feel sorry for you that you think this. I know many marriages where they were faithful for 20, 30, 40, 50 years. My grandparents and parents. And guess what, some of their friends (in fact many).
It's not as uncommon as people think. Also, cheating is not everyone's weakness. Maybe those donuts are your weakness
Marriage is hard and it takes work. No one is perfect. You may have a husband that never cheats, but maybe he's a grouch to be around at times
Or, you may have a wife that is faithful, but she's messy as heck
.
There's a price for all things, and marriage is no exception.
And while I am all for no infidelity, I also can say I know and admire couples who had infidelity in their marriage, and still worked it out, and by God's grace, their marriage is actually stronger.
Sometimes people need to ask themselves, "do you want a 'perfect' marriage, or a good marriage?"