Seeker.....I know that hearing that they are with someone else feels weird and awful, at first. It is just another step in facing the reality of the situation...and, it will pass, like all the rest of it..
You have done so well, since coming here...And, I think it is directly due to the hard work that I see that you have put in!!!!.....as well as time away from the situation.....
I think you are going to be just fine.....