I guess I misunderstood -- was this a date planned with T to watch a game?
If T let Seamus know to pass the news on to the group that he was not coming because X, then yeah, Seamus ought to pass it on to the group.
It was actually to play a game, which we do once a week. I join them over Skype, although I can't participate much, but it's the only time I interact with his coworkers anymore (I used to see them a few times a week), so it's important to me, because I'm isolated here.
What happened is that T went on vacation, and although some people knew, Seamus learned about it when T wasn't at work on Monday. We regularly play the game (which is on Tuesday nights) with one person missing, but in the past I'd always known ahead of time. Now I think T should have told the group, but when I learned suddenly, my first thought was that Seamus was my eyes now that I'm away and lonely, and he didn't tell me anything.
I'm feeling over it now. When I first learned, I was upset not to have been given a heads-up, as I felt I might not have joined the game and slept through it instead, if I had known. But in retrospect, I understand why he thought it wasn't a big deal. I guess one issue I had was that he always told me when other people couldn't make it, so it felt like the one person I cared about making it or not shouldn't be the one he doesn't even mention to me.
Oh well. We might talk about it more later. I think he might have today off, since it's Independence Day.