I'm prescribed 5 grams a day (can't afford it), but generally manage about 1.8g/day or slightly more than 2 ounces a month. Really, I think that 0.5g a day is nothin providing your use is well adjusted and doesn't interfere with the rest of your life (etc, blah, blah).
I've been up for ~4 hours. As soon as I woke up, I took a bong rip (directly before dialysis). And I'll repeat that sort of useage throughout the day. It's in the evening when recreational use largely happens - and I still don't see a problem with that.
If your boyfriend is pissed and really screaming at you; then dump him. No need for someone to control your life.
Tom