I will probably get the blame that I am a coward for not leaving the truth alone when I woke up. I can say I am guilty for that point, but I am also guilty for loving my wife more than the truth or more than TTATT. I always wanted for us to do the things together and accomplish things together, finally I wanted to grow old with my wife one way or another.
Stop feeling guilty! That is a Watchtower induced reflex, to blame yourself for not being perfect. Maybe you would do thinks differently if you knew how they would turn out, but you didn't (and couldn't ) have known, you did the best you could based on what you knew at the time, so stop blaming yourself, just stop.
Being older I have seen a lot of marriage fail and I can tell you that it's very likely that she would have eventually left you no matter what you did. If she feels she married too young then that means she didn't feel happy or fulfilled, even if on the surface things seemed to be going well. She was just stuffing those feelings down because she thought she was stuck, it doesn't mean she was happy. Lack of fighting does not necessarily mean a good marriage, it can also mean you just don't care anymore. Would you really want to have stayed married to someone who feels they made a bad decision to marry you? Your leaving the religion gave her the out she wanted and she took it. I think you both will be better off in the long run, however painful that is in this moment.
The end of a relationship us never easy, so give yourself some time to grieve, to heal and to reflect. You will move on from this and hopefully meet someone better, someone who loves you and wants to be with you.