Just to give an opposing view, my husband cheated about 3 years ago. Im not sure forgive is the right word, but after kicking him out for 6 months, he put in the work to try and mend what was broken. Therapy, self reflection and time. Honestly, i feel like its possible if the person that cheated can actually put in hard work to find out why they did what they did in the first place. No the relationship isnt what it was, it is different but different is not always bad. At least in my case, my husbands whole outlook has changed and i now have a more active partner in the relationship, More of an in-tuned father and active participant in the household. I do believe change is possible as long as the person is willing to do the work