It is bad for him to do that, but that is the desperation between the two brothers isn't it? When it comes down to it, those two just cannot bare to be parted - and that is the reason we love the show. It has always been about these two brothers and the things they would do for one another and at last we have it back! Its not going to be plain sailing for any of them, and Sam is going to freak, (plus I do think that Crowley has had a thing for Dean for quite a while, and at last he has him). But yes, bring it on, let the good times roll.