There's something not quite right about this woman... for one she's not over her bf/ex, and it doesn't appear that she will be anytime soon... then she drinks way too much and puts herself in a compromising position... then she further her poor judgment to drive out to her bf/ex at 3 am stumbling drunk - it's a wonder she didn't kill anyone. No, this woman has irresponsible written all over her.
A relationship with her would probably involve her breaking with you over and over again as she runs to be with her ex and then you... etc. Who needs that drama?
Plus if she makes poor choices like drinking excessively... what other poor choices would she make? Do you really want to be with her when the consequences of her actions end up affecting you to?
This woman is pure drama... I wouldn't walk away if I were you... I would RUN!
There's easy and then there's too easy to complicate. This woman is just a string of complications for you.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen