I think this is where the problem lies, if
my guess is correct.
If my assumption was accurate, you went into a relationship with
her, simultaneously acting as her counseller. Here, you are not
only breaking the code of ethnics for a counsellor (fine, you are a
volunteer), but this is also extremely unprofessional, to be
romantically involved with your 'client'.
If I am wrong, kindly ignore the above statement. 
***
There is this heavy mote of self pity and extremism
in your post. You are trying to foster that knight in shinning
armour phenomenon, thinking that your love for her will enable her
to straighten her route to a brighter path. It can be incredibly
noble for such self sacrificing ideals, but we must have a common
understanding that your love is NOT a panacea to her addiction
because your love is nothing more than a speck of whirling dust in
her eyes; currently, your not the only man in her life my
friend.
Please burn this theory in your mind: if you are in a relationship
with someone of inferior esteem/mental state - if one cannot
enlighten/evolve their partner to be positive/stronger mental
state, your partner will influence you to become like themselves.
Understanding this, your suicidal thoughts are probably the result
of being with her and it has affected you at subconscious
level.
To kick her addiction requires little of your love; what she needs
is professional counselling or intervention of lawful
organization... to learn the consequence of her own karma from the
foolishness of her doing. I suggest you give up having that idea of
changing her, via having a relationship with you - that sort of
love is terribly narcissistic. If you truly love someone, you will
do what is necessary for her to kick the addiction, even if you are out of the
picture. This is to the extend of her hating you
for the rest of her life because true love will not allow you to
haughtily see her engage in self destructive behaviour, if you had
to power to do prevent it.
What is love to you? Just to have her by your side?
That's so fcuking self absorbed! Because ultimately, you will discover that the
one you love the most is but yourself.
You would rather NOT incur her hatred by accepting
her self destructive behaviour in a manner where you would try, in
vain, to contain it yourself, than to risk this
relationship/friendship with her by reporting it to organization
that could actually help her, in their own ways, to break her chain
of addiction.
The addiction and bad social influence she is being subjected to is
beyond you - it has claimed her soul completely. If you wish to
live in denial, thinking that your love could change her... would
change her... alas... please wake up your idea cause I am saying it
twice: it's
beyond you.
The bottom of all; you attempt suicide. For gawd sake, if you think
that she is the one engaging in self destructive behaviour and
needs to evolve, I reckon you are also in need to change yourself
because attempting suicide IS INDEED a form of self destructive
behaviour.
Read what I had said or scroll through with selective perception -
your choice.
Cheers
