Carrying a pill in his pocket means -keeping oneself ready if the opportunity arises. If he wanted to use it when he is with you , he could have kept the pill in the house itself. The situation can be considered suspicious.
When my husband had his affair,,after everything was discovered,,i found the empty viagra packages,,He never ever had problems,,Iguess when you sleep with two people you need it,,i ascked him why ? hE SAID HE WHANTED TO TRY IT,,only since his affair of course