Background: Friend is male, I am female, been friends since school, nothing romantic involved.
Friend was dumped by his long term girlfriend last year and ever since has been leaning on me for help in finding a new partner. He texts me constantly asking why nobody likes him, why he can't find a girlfriend, and asks if I can set him up with my friends 
I've explained multiple times that my friends either do not like the idea of being set up on dates, are already in relationships, or are gay. And I don't have that many female friends to start with. He even asks if I can arrange nights out with my friends and invite him along just so he can try to romance them - which to be quite honest I'm totally uncomfortable with. I would feel like I'm some kind of pimp.
This has been going on for a long time and it's really starting to exhaust me. There's nothing I can do to help him. I'm not a love guru, and I don't have some infinite supply of women to give him to choose from. But I receive these comments every day and I just can't take it anymore.
Am I unreasonable for wanting him to stop? What should I do?