what were the 'stories about Rex cheating on her' that nicole was on about in the diary room?

[ruination]

Have there been tabloid stories that he's cheated on her?

[Adamw92]

Yes, where have you been, about him cheating on her when he went on holiday to Vegas

[Annie]

There have been millions of threads on this... go into Rex and have a look back.

[Jackie]

Been in the papers a while back now.

[Greg.!]

He apparently cheated on her 3 times with 3 different girls

[ruination]

Oh dear ..

Well, doesn't surprise me.