He was in the US during SCD (and started a panto role on the night of the Final), hence not being in the audience every week - though he tweeted every weekend about the show and was clearly supportive of Denise.
It's typical of the media only to pick up on Lee not being in the audience and not to bother actually getting the full story. Perhaps they're used to celebs' OHs not having lives and careers of their own and always being joined at the hip (and leeching off) their celeb partners
That's a very valid point.
Two people can have entirely separate careers without there being anything suspicious at all.