If it wasn't clear before, it's clear now--it's the one thing I understood BEFORE I decided to start researching the JWs. I told myself, "This is a one-way trip. If it turns out it's all a lie, no one will ever believe you. You will lose everyone you have ever known. Are you prepared to do that?" Once I learned all that I could, I realized that I simply didn't want friends who were willing to obey this sort of teaching without question. I shut myself down and distanced myself from everyone... ...Almost everyone. And the one person I cared about most was my greatest downfall in the end. I learned to turn off those feelings as much as possible from then on.
There is no limit to how far they will go to turn against you once they know you've got major doubts. As has been said, you may as well take the initiative to cut them all off yourself, delete all of their messages, unfriend them, etc., and be done with them. Because they are done with you. It's a matter of sanity, in my opinion, to be able to do this. (Then again, the guy who married into the cult knowingly probably ain't in any position to be giving you advice. See to your own house, sd-7!)
It's war, from the second they found out about you, and there are no rules in war, only people getting hurt. Tear every feeling for them out of your heart, or it will make you vulnerable. They can use their bond with you as emotional blackmail in the long term, and that would be torture. Don't give them a chance to do that.
--sd-7