I agree with Direction.

For your own well being and that of your partner, you are going to have to set some boundaries as to what behaviors you will tolerate, what your partner must do to remain well (take meds regularly and see the therapist/doctor, etc.), and what you can do to help your partner find their path to wellness.

You are to be commended because it is patently obvious that you care deeply about your partner and only want what is best for them and for both of you. With some tenaciousness on your part, you can emerge from this illness with your emotional well being, and hopefully your relationship, intact.