If it helps, I play through things like this for the first half of the game, and feel like my character should go on a more redemptive path the second half of the game. So I get cured, do more main-quest stuff, more Aedric stuff, etc..
That's one way of rationalizing your way through some of this, if your longterm intention is not to be a werewolf.
But yeah, it svcks that things like this are forced. It's one of my main gripes about the game: the lack of "active" participation in choices, especially with guilds. Like the only way to make a choice sometimes is simply drop a whole questline and leave everyone and everything in limbo. which is dumb as hell. That works, but it's not a very interactive way of roleplaying. This apprach happens again with the main quest with Paarth too.