People don't change just because you want them to; they have to want to change and then have a chance...
this, i lost my fiance and gf of many years to my my addiction. luckily she's back now that i'm sober but losing her plus multiple seizures from withdrawal didn't make a difference until i was ready to do it.
If she really loves you she will quit the drugs .
good luck with that logic, it didn't work for me or most other addicts i know