DP has had friends for a long time (over 10 years), he set them up as a couple and when we started dating we got on very well as a group of 4. Over the last two years the distance has become a lot more noticeable as our lives have changed. We bought a house last year and they still havent bother to come over, even though they bought one this year only 10 minutes up the road.. everything just seems like so much hassle for them, even replying to a message or if we try to arrange something on our terms and its clear the friendship has died out.
Now the issue.. she is meant to be my bridesmaid and he is meant to be best man at our wedding next year. What would be the best way of approaching this? Do we just let it fade out and not mention it until it's a stage where they assume it or specifically say that they won't be part of the wedding party (nicely though!).