My fiance and I asked a good friend of ours to be an usher in our wedding back in December (the wedding will be in August). Since then he started dating this girl and has distanced himself from our group of friends. He has bailed on everyone's bday celebrations and other milestone events. He has not really hung out with any of us since January. We are hurt that he has basically cut us all out of his life when we used to all be such close friends. The only reason I still even talk to him is because we work together, and he hasn't even been pleasant in the office. I will be leaving this position sometime between May-July as it is an assistantship to pay my way through grad school and I will graduate in May. Is there a tactful way to disinvite him? Should we just not mention stuff to him anymore and hope he gets the hint? The way he is acting now I'm not sure he cares to be in it anyways.