I am trying to focus on myself and let him do the same, but it is still scary being so far away feeling like everything you've invested is at risk.
One of the things I learned after leaving my 13 year relationship was that I over invested in him and the relationship and very little into myself. That I was investing in someone who truly was not investing in himself but I was unable to see that while so emotionally entangled.
My personal experience is that investing time, energy, emotions and finances with an addict with hopes of a "normal" type long lasting relationship is like investing in an igloo farm in Florida. We had times where it all felt great and seemed to be moving forward but then it would all melt into that toxic hell once again.