Horridon heroic broke it. Or was it Tortos. Anyway, the guild didnt break up at all, only the raid group (2/13h) but the top healer stopped raiding due to work hours + raiding hours being too much for him, he was also the raid leader, so after that our 2 top dps (boomkin and rogue) deflected to other guilds with better progression (5/13h I believe), then another 2 or 3 people were gone as well. It was a very well-knit group of friends (or so I tought), we've been raiding together since late Ulduar.
Now I sit bored in two moons every night waiting for lfr queues in alts. Yay.