Is it okay to leave after my partner relapsed?
Why don't you want to help them work through this?
I don't want to stay in a relationship with someone who can't take care of herself.
Dealing with an addict can be very stressful and depressing at times.  As much as I hate to say it, you may be right wanting to leave her.  Life without addiction is so much simpler.
I agree. I've been a good sober partner for a long time but she just has to ruin everything.
They could use your help, but if you are no longer in love, then you should consider their feelings and break it off. You have to look out for yourself as well and their influence could bring you back down with them.