You are at a decision point. I didn't read your whole situation, but what I did read seems to say there isn't another person (if there is...they have to go first before anything else). Don't get overly caught in the "I have to be dark" world. It appears as if your wife reached out to you.....now you control the situation.
So what do you want? And if it is to rekindle your relationship with your wife...what are you going to do about it? I wouldn't recommend running like a mad man and smothering her. With that said..texting might not be bad. Emailing and IM'ing might not be bad. Open up to the communication a little bit if you want. I am sure you are busy, but tell her you would like to spend time with her. The key is (look in your older posts for this one) you may only have one or two times a week that fit in. Remember how hard you wanted to pursue when she said that to you. Turn the table around...flirt, but don't jump. Open up, but don't over expose.
The choice is yours.......I only suggest act elusive and let her chase you...not the other way around. Just be open to her chasing.