Can my relationship be saved?

[a girl]

I'm being careful, no worries. My primary concern, as is his, is our children.

I'm actually beyond caring what H does, except as it relates to our son.

If you're worried we'll rebound with each other, I can understand that, but please don't be - my husband may think that telling me it's over means that sleeping with her didn't violate his wedding vows, but I don't have the same opinion.