I Have a Question

yep.

I think it is generally true. I know a man who has cheated on his partner over ten times. Each time she finds out (which isn't every time) she's shocked

Trouble is, when the cheaters are forgiven, they know they can get away with it... so they keep doing it... generally speaking...

in the same relationship? yeah. but i don't think someone who cheated in their early 20s is incapable of growing and maturing

No, I do believe that people have the ability to change and reform from past mistakes.

Depends. Have they ever held a steady relationship ?

No I don't believe it. If I cheated once that doesn't mean I will always cheat.
What about you

I can forgive a cheater, but will still let them go until they can gain my trust back

No... But once warned counts twice

Yes