I just wanted to say (a bit belatedly) welcome to our forum, and thank you for sharing your touching story. I'm sure you and your wife (and the new lady) will be fine, just keep the channels of communication open and continue to be caring and considerate toward each other.
I hope your time spent on Polyamory.com has been helpful so far, and will continue to be helpful.
Glad to have you aboard.
Love means never having to say, "Put down that meat cleaver!"