I think these are definitely positive signs FS. He is starting to become more aware of his own feelings because you have given him the time and space to do so. Keep doing what you have been doing. No more, no less. I think you have found a pretty good balance of friendly but not too friendly. My H mentioned the other day that his place is getting a bit tired or old... can't remember the exact word he used but it is the first time I have heard him say anything that sounds as if things may not be super duper where he is. But...he still seems happy to go there and hide every day. I am still working on GAL and detaching and feel like you are further ahead in the department than me. And you are in the same boat in terms of how much contact you have. It is tough to detach from someone you see or hear from almost every day. I think you responded to the invite perfectly. Let him sweat it out for awhile. If you go, great, if you don't, guaranteed he will be missing you. Almost makes staying home worth it...lol.
I reread some of my texts that I sent my H in the early days when he was wanting to come home and feeling the weight of everything he had done. His texts implied that he expected I would be wary about having him back and maybe want to protect myself a little bit... he was prepared in the moment to do the work. I cringed when I read my responses. I love you's and WE'LL get through this together, etc... I wish I had known about DBing then because I would have tried to curb the enthusiasm a bit. There is no doubt in my mind that my enthusiasm scared him back into his tunnel again. Even though he was the one reaching out to me, my response was to basically pursue him again. Ugh. So my suggestion to you is that WHEN he starts to put himself out there to reconnect, do NOT jump all over it. Be open to the idea but give him the impression that you are considering it as opposed to grabbing onto it with everything you have. Be cautious and don't give up the gains you have made. I promise that when/if the time comes for me, I will do the same.
As per usual, I think you are doing a fantastic job. Have faith. There are some good signs that your H is starting to question his choices. The less you respond to this, the more he will question. Practice patience and take care of yourself above everything else. (((HUGS)))