Let’s use our common sense and figure out if there is a reason to worry and how to recognize cheating on a trip. The first and most obvious warning bell is when your partner stops contacting you or does it very rarely. But you don’t have that. If you’re really worried, you can use the tracking program at https://signscheating.com/signs-he-cheating/. And use his phone to make sure everything is okay.
Separation is always a challenge, and it is simply impossible not to miss your loved ones. Of course, everyone expresses his or her feelings in his or her own way because of his or her character. But if he does not miss you in any way, then you should be worried, of course.