Rick Gates, the prosecution’s star witness testifying in the federal fraud trial against Paul Manafort, revealed Tuesday that he once had an extramarital affair that involved maintaining a London apartment — but said he couldn’t recall if he used money he embezzled from Manafort to pay for it.

The topic came up as Kevin Downing, Manafort’s defense attorney, hammered away at Gates’ admitted habit of filing doctored expense reports in an attempt to paint Gates as self-motivated and untrustworthy.

Downing then asked about what he called “the secret life of Rick Gates,” inquiring whether Gates kept an apartment in London and if he engaged in an extramarital relationship there.

“I admitted to a previous relationship,” Gates said, adding that he maintained a flat for about two months. According to The Washington Post, the affair occurred about 10 year ago.