Is my new partner affected by my mortgage shortfall debt?

I have just received a mortgage shortfall debt from 3 years ago with a house I had with an ex, I have been to citizens advice today whom basically told me that even though the only thing I pay into his house is the food bill (everything is in his name and he pays it) that his income and house will be taken into account when recovering the debt from myself, is this true? I can't seem to find anything online to help. This has naturally got myself and my current partner worried - why should he have to be included in something thats nothing to do with him?
Any advice is welcome.

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