A Not So Reluctant Matchmaker

I consider myself to be a bit of a matchmaker. I'm usually pretty good at it, but, like all people who open their mouths to give advice, sometimes it goes horribly wrong. Not like anybody's lost a limb or anything, just that sometimes my instincts about this kind of thing can be off. My girlfriend thinks I should just keep my mouth shut and let people find each other on Internet matchmaking sites.