When I questioned him about who answered his phone, he said no one.
So he told this initial lie in addition to lying about being in the loft.
@Chelc23, your P is not protecting his fidelity. He’s been looking up OW and lying about why. You’ve heard them flirting during their constant contact. She feels entitled to answer his phone, which suggests over-familiarity. When you ask valid questions, he gets defensive to make you back off. And, of course, 2 condoms are absent. I don’t believe that you miscounted.
Regarding their finding time to conduct an affair, the emotional closeness would be developing as they interact at work and in calls/messages. As they’re out in the field together, they can find alone time for intimacy before work, during lunchtime, or by leaving early or taking time off.
Have you investigated his phone, statements, pockets, etc.?
He appears to be using a 2-prong cover: the controlling Ex story to explain her need to reach out and his KISA role, and the bunny boiler deception to con you that he’d never be interested in her.
Please don’t gaslight yourself with doubts, @Chelc23. Something illicit is going on between them. He is undoubtedly attracted to OW’s attention and validation, and is enjoying extra cake.
You don’t have to tolerate his disloyalty and abuse of your trust.