If the items are not of an urgent nature, let things be for a while. Right now, he knows that the belongings he has of yours are the only "string" he has to the past and to keep in touch with you. The more you ask for something, the more likely he will to dangle them to keep you on the hook. The less you appear anxious to have your belongings returned to you, the better.
As for the ow, she may still be in the picture, it is something that we do not know. They tend to hide a lot of their lives from us.
I would leave him be. Do not ask for your things again. BTW, threats of lawyers, etc., will not work. They will just dig their heels in future. They don't care about the law one bit. Leave him in God's hands for now. He is the only one that can heal his inner pain.
Keep the focus on you and your life. Please, please do not ask for your things right now. When he sees that you have lost interest in his little game, that is when the door will open and you will get your things.
Please be patient and keep the focus on you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
