Guilt would be appropriate if you were intentionally trying to hurt him.
That said, none of us likes to see someone suffer - even if the suffering is self inflicted.
All your actions are necessary for you to be healthy and for him to recognize his disease and get help. If he were open to a different path, he would have taken it.
And - I do understand the guilt. But for me, my guilt came from an over-adapted sense of responsibility for other's actions that was imposed on me from my dysfunctional childhood. I hope you can hear the folks on this forum and believe at least a little, if not a lot, that there is nothing you need feel guilty about. Sad, yes, scared, maybe - but you did not cause this.
Prayers for peace,