Hi Joyinmotion and welcome back. I'm sorry for the circumstances but I'm glad you reached out.
First of all I absolutely agree with your friends - it's kind of a mantra here -
Safety FirstThe times of highest risk are times such as the one you're in right now. You've left the situation (understandably so), and now your DH is seeking "care." You've likely been providing a significant amount of emotional support for the years you've been together, and now that is changing. You will see some frantic efforts to return things to status quo, and this may include threats and behaviors you're not at all accustomed to (e.g., cutting off your cell phone - believe it or not, this is something you might want to consider as a serious warning sign).
In seeing the experience of many members here, sometimes friends and family can "see" things we don't - so I repeat, listen to your friends.
Congratulations on your progress toward getting your teacher's license! That's really hard work and something to be really proud of. It sounds like you figured out what you were aiming for and went for it, and it's paying off. That's a big accomplishment.
It sounds like you'll need some of that same determination in the next steps of your relationship. You know your DH needs help, but you can also see that he's not willing to put in that level of commitment (and it's a big commitment to tackle these kinds of disorders, for sure!). You'd need to continue to give a lot of support to your DH if you were to chose to reconcile and resume the marriage. It's important to look at it from perspective, and now that you've got a little space it's a good time to be honest about what it means to go back and try and improve if that's what you chose.
If you chose to continue with the separation, there are sometimes options other than divorce, and it's important to know what options exist. One thing that really helps is to seek local legal device to see what all of those options are. For example, if your DH moves beyond cutting off cell phone service and starts trying to interfere with utilities, rent/mortgage, etc, what are your options, especially in light of the prenuptial agreement? How can you continue to take care of YOURSELF in these circumstances. You're probably really, really good at taking care of your DH, but now you have to be really focused on taking care of YOU, too, more than ever. Here's a hint, though - it's good to practice taking care of yourself in ANY circumstance, too.
You've got a lot of really big changes ahead, Joyinmotion - we're here for you. How can we best support you?