Marriage ended after several years because it was the best for both,supposedly.

Ghost had always been a lonely man so when he divorced he was completely alone in family terms.

Things ended in a good way,and at some point he ended up asking you for help,mostly with food since he was such a bad cook and you agreed ofc.

So here he was again,in front of your door ready to spend another of his free hours of lunch with you,divorce hit him hard so this things made him feel in home again.