Wow! Well, on the one hand it hurts to get to this point. On the other hand, it is a necessary step.
I think that you really do need to start with you. I think you've been focusing on you xH, maybe hiding from yourself, perhaps. So, now it is time to stop that. Go ahead and pull back from him a bit, if you need to, to concentrate on yourself. Learn about yourself, and learn to understand yourself. You really have an opportunity here, in my opinion. Your xH still loves you. He is giving you the time you need to take care of yourself. So, it's time to hop to it! No more worrying about what he is doing, that will take care of itself. Let's be concerned about what Jen is doing. How she feels about herself. How she feels about others. What she wants from life.