Does anyone have any recommendations for him? He's more of an avoidant attachment type and I think it would be a great opportunity for him to get in touch with more of his own feelings and style of communicating/thinking as well as understand those around him!'

PS. As much as I'd love to recommend something selfish like "How to Improve Your Marriage Without Talking About It" (which I love!!) I know that this isn't specifically about relationships :)