Hey T. Injuries are frustrating. Softball and flag football did a number on me a few years back so I've taken to sparingly doing much more than basketball and some free weights these days. I hope you heal up quickly.
As is often the caution in these pages, enjoy the moment with the new lady in your life. I'm sure you've read past forums on the amount of time recommended between the Big D and another, serious relationship. As you and DnJ have suggested, you're still decompressing from that lengthy experience and tethered to XW through parenting. So, have fun, stay focused on yourself and being the best dad possible, and just enjoy the ride for a bit.
Hearing what XW commented to your mutual friends is unsurprising. They have to say those things to reassure themselves THEY were in the right....to reinforce that their decisions was right and their former spouse the sole cause of the D, especially when 1) hearing you're OK and 2) worrying you may be doing "better" than they are. It isn't a competition. Your lives on on separate paths now. You are the prize that got away!