Let's see now...
Duke Nukem was in love with himself and his overcompensatingly awesome firearms
Gordon Freeman was in love with his crowbar
Master Chief was in love with his armour
Louis was in love with his pills
Sam Fisher was in love with the shadows
Jack Carver was in love with his Hawaiian shirt
The elite crew guy from the terrorist force in counter-strike...source, was in love with his...sweet goatee
And that's about as much cleverness as I can come up with right now...HARRY WAS IN LOVE WITH HIS PITS!
I see your point and I think it's cliched and just fucking stupid whenever there is EVER a trace of romance in a game (Aside from mario and princess peach, I feel like I should give them a free ride). But to be fair it's not just Americans who do it, look up a Japanese eroge game and you'll see that games the Japanese make have more have love in them than any other video games.