Not sure why my friend is acting this way

So I met this woman a year ago via a online game, she was married to a mentally abusive guy, I helped convince her to get to spereate from him and ultimately divorce him along the course of the year, as well as feeling did mature between me and her romantically, unfortunately recently however another guy has came in and swept her off her feet and wooed her which is fine cause she's now happy but since they have started dating I have been getting the cold shoulder and I am unsure of why!

Believe it or not, this is an issue that I've seen happen in nearly every game that I've played over the decades. There are so many factors that are involved, but I personally think it's just a chemistry thing. You could be the funniest, brightest, loyal, and greatest guy that she plays with, but you can't help who you fall for ultimately. However, it sounds like you're cool with her finding someone that makes her happy, but if she doesn't respond to a simple - "hey, I just wanted to check on you, don't be a stranger," then maybe it's best to let her go. A true friend would still keep in touch, no matter what the situation is. Just my two cents though!