How to tell if your Gemini partner has a lover?

Geminis have shallow affairs

Gemini is a sign reluctant to compromise and, therefore, a candidate for the hidden romances.
It is common for Gemini to maintain two simultaneous loves, though his adventures always tend to be superficial, to the point of not affecting the reality of the established couple.
The Zodiac eternal adolescent displays his immature attitude seducing or conquering whoever is on his way.
To find out you just need to pay some attention to his speech, in his case the saying: “loose lips, sink ships,” is always true.

Does your partner have a lover?