married to a Truck they all Cheat

I have been married for 11 yrs. I'm asking to see if anyone else out there has had this problem or if they r the ones out there going with the truck drivers that R MARRIED...I'm faithful but i dont trust him as fall as i can throw him. He did it to me 6yrs ago..i found out 2 yrs ago he told me...we together done a threesome he was making it up to me..but my point is do all truck drivers cheat on their wifes and if so why???? i dont get how we can be faithful for 1 to 2 weeks and a man cant keep it in one day....u dont know what he is doing and can not hold his hand to make sure he is not donig anything waht do u do ??????