Guys, do you sometimes feel like you're just your girl's fashion accessory? Do you feel like you're being dragged to weddings, birthdays, and family functions just to nod and laugh at all the right places? If you just screamed "yes!", then good news: you're still a part of her future. You've got plenty more nights of forced socializing to come.
If her invitations have dried up, and you don't even have something you absolutely have to come to or else in the next couple of months, then you're in trouble. There's three possible reasons: either your jokes have been terrible lately, or no-one in the world is having a birthday, or she's planning to dump you. Or a fourth, even more terrible, option: it's slipped her mind because she's busy daydreaming about having someone else on her arm.