well, i did.
and i'm really glad i did. it's so much fun! (i'm preaching to the choir, i know)
this is how we ended up doing it (because, if you remember, i was afraid of how this would affect my relationship):
i started a character on his account--a gnome mage that i named Amoreena. i got a little (okay, a lot) frustrtated at first (my boyfriend said that was because i chose to be a mage), but i ended up getting up to level 15 or so before we got another account for me to use. he has 2 computers set up in his apartment, so we sit right next to each other and play. now i have a gnome rogue named Nonanone (nonanone is a molecule excreted by bees and wasps before they sting, so i hear) and he's playing a dwarf priest. i'm a lot more confident in my playing now, and he and i always play together.
so it all worked out really well.
this was just me checking in to say thanks for all the feedback from my original post. :-)