Hi Seedpod,
Im sorry the wound was opened back up when he contacted you. Having an ex come by with his new girl would be like pouring salt on it IMO. I think if you could transfer his things to a storage unit or something would be good and help bring closure.
Thank you for your post. Its recommended people who suffer from addictions seek personalized care which can meet all their individual needs. The same approach must be used for family members and friends because no two situations are alike, and people are all blessedly unique.