it's totally normal. i'm sure you won't believe me, but be glad that you don't live with him right now. i am thisclose to killing my husband just for being around the house too much, and for nagging me about not spending enough time with him, not doing anything around the house, etc. i HAVE taken time out to spend with my kids (not as much as i'd like) and it has totally set me back. i consider time with my kids necessary, and i have no choice but to have my husband around (and i've even gone to a movie, some dinners, etc with him). if i had just a boyfriend who didn't live with me, i would not be spending any time with him right now. maybe a phone call or email at night to check in, that's it.
don't feel bad, it's not you and it's not a dis. he probably had lots of time for you during school, and it's hard to understand why he has none now. bar prep truly is much more time-consuming than law school. hang in there.