I may have experienced something sort of similar, though my beliefs were more negative and paranoid.

I used to worry my boyfriend and his roommates were trying to poison me. As my boyfriend was kissing me I feared he was slipping a drug into my mouth...but though I was consumed by this thought, I also realized it was "crazy" (but also that crazier things have happened!). Rather than throw him off me and accuse him (what I imagine one would do if they 100% believed that this was happening), I let him continue to kiss me while I obsessively went back and forth between "what if" and "no, couldn't be"...

On the other hand, I once believed 100% that he was cheating on me with a neighbor (really he was just giving a lost driver some directions)...but still, when we had a huge blowout fight, I didn't bring that up specifically, because somewhere deep down - even if I thought it was true - I knew it would sound crazy.

I've never been diagnosed with psychosis. My psychiatrist at the time referred to these as "pseudo-delusions" - which seems kind of similar to the 'grey area' mentioned in the article. Strange and irrational thinking - enough to derail you - but still tethered to reality.