SS, keep posting here like a journal. Ask questions. Others who have been or are piecing should come along soon enough to support you.
Remember, piecing is different. What you did initially is to detach and move forward, now... you must re-attach. A huge part of that is to fix what ever trust issues were broken in the first place.
Again, what were his reasons for leaving? Think back on that. I get that type of conversation with him might scare you (and him), yet these things did not just go away.
Did you fix the things you know were his original reasons for leaving, that were in fact valid?
What about his issues? While you work on your things, does he know what things were / are bothering you that he could work on?
