Our expert says:
I like Maria's comments, and others. Maybe he is a cheap-skate - some people, often especially the really rich, are mean. Some folk who have been really seriously poor, have great difficulty in shaking the habits of being poor, and feel bad about spending money, even when they can well afford it, and often especially when spending on themselves.
Romany's suggestion is interesting, and would be revealing - you could suggest the dinner to celebrate his "huge deal" and talk about it.
As Obvious points out, some people have a specific problem about eating in front of other people, nothing to do with cost.
But surely the basic need is to calmly and gently talk about this with him, expressing your concerns that he seems to never eat, and that you want to understand what is going on.
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