I remember the encouragement you were giving me way back in the early summer.
Try to look at the good side of this. The ghost shows up and leaves a message. Your H didn't hide it from you and you witnessed emotion from him. You got to experience how she made him feel.
I haven't a clue as to how a final ending/closure could be made that will make her leave you and your H alone but maybe your H can lead that conversation.
I keep hearing that any contact is bad but there has to be something that a 'couple' can convey that will get the finality across.
Glad things are going well for you, otherwise. Take care!