“He’s still single today in his 40’s; he says he never went out with anyone he was attracted to”.
In the words of a highly regarded Shadchan I know who has made well over 100 Shiduchim- “Any guy who has been going out steadily for a year or two and cant find a girl hes attracted to, hes got issues which need attending to” (which very well fits in the case you describe). She said this applies to guys who have many more opportunities than girls. I think if no girls are attracted to him, that signals an issue as well. Of course we can now wave the Bashert issue, where I answer its Bashert he should have an issue.