Wow man, that is tough. I am all for second chances, but you seemed to have moved on well, and sure enough as soon as you are comfortable again, she sees that and now wants you back. Do whatever you think will bring you long term happiness.
I think some counselling sessions are in order, either way. You guys are gonna need some professional help whether it's for reconciliation or closure. And until then, don't touch her, in any way.
That's a very personal decision Woot. There are many reasons why people cheat and many dynamics to factor into the mix and we know only the surface details of this thing.
Whatever you decide, I pray for God to grant you and your family peace and love.