if you understand portuguese you do know that it calls the "affair" rumours and that it says that his marriage to Patricia is going very well (so well, they're expecting their first child) Besides those "news" are from last year.
But, here's the thing, I don't know Nuno, he's not my friend and I'm not related to any of his friends or family so, I wouldn't know if he's faithful to his wife or not.
The only thing I know is that, right now, in Portugal, the only thing newspapers say when they talk about Nuno Gomes is that he and his wife are expecting a boy for this July and that he wasn't called to the NT. That's it.