Have you ever noticed how your powers of discernment have noticeably sharpened during this entire journey of being partnered with a sex addict/compulsive? Part of that comes from frequently having to figure out if you're being given the truth, weighing out what you're told against what you perceive.
While we are having to rely on our intuition over and over again while in relationship to a SAC (sex addict/compulsive), it might be worthwhile to learn some basic skills that can help us along the way.
In the TED Talk video below, fraud specialist Pamela Mayer encourages us to educate ourselves on how to detect a lie but then we're also admonished to "....go the extra mile from lie-spotting to truth-seeking....and ultimately to trust-building". I don't know a single POSA who wouldn't desire that exact trajectory. Cautiously, of course.