Was going to put this in the 'red flags' thread, but that is serious, and probably important.
This isn't really - but it was a sign I should have taken notice of earlier.
Obsessive collection of a) Star Wars figures, and b) vests: he turned out to be a) an eternal kid, and b) gay. Lovely guy though, and we split very amicably.
Anyone else had similar moments of blindness in past relationships?