There is always a "chance" ~ they do have children together and I don't believe that they hate eachother (like so many other couples) ~ He just got caught.
Give it some time. Time heals all wounds... so they say.
Some of us here have been through this before. There is always a chance, but she will NEVER forget what he did and it will take FOREVER for her to ever trust him again... which will actually be the focus on any re-uinification.