Why do men get so angry at minor loyalty tests?

Is it because you're secretly afraid you will fail?

If you aren't doing anything wrong it shouldn't be a problem.

Updates
+1 y
To clarify, small loyalty tests like getting another girl to hit on them at a bar when I'm not there or send him a DM etc, to see if he tells me about either of these things or if he just ignores them or goes along with it, or maybe asking randomly out of the blue to see his phone right then and there, all simple, normal stuff
Why do men get so angry at minor loyalty tests?
Post Opinion