honestly, I probably would have made her work for it a bit harder, I think you're still too easy.
"I'm not sure how I feel anymore about you and your relationship, your affair made me rethink everything. I need some time to consider my options and find out what I really want now, not sure if this is it anymore...."
and then left it at that.
In her current state, I bet you she will pull the jekyll and hyde routine so don't be convinced of her initial actions right now, she may be testing to see if it's that easy to come back after all that she's done.
Playing hard to get isn't a bad thing, maybe let her worry for a little bit that you're done with this situation, make her work a bit to get you thinking that marriage is a good thing.
