She brings up her ex, in a good way...

I want to know why you're bothering dating someone who is a trainwreck and possibly a nascent (if not full-blown) alcoholic.

I agree. Watch her drinking.

How is it that she ended up with her ex. (of all the people) and in that condition?

She's got some 'esplainin' to do, Lucy.

She doesn't care what she says to you because she's moved on. You're now a random friend she can say random **** to.

Dating someone turns into a relationship, usually within a few weeks.. There is a connection, no baggage and so people give it a go.

6 months of dating, is company both in person, dating, and sexual.. Nothing more. Usually, because the person in question hasn't moved on, or is not ready for another relationship.

Your thoughts on the said matter are what you are "hopeful for"... Which means you don't know her at all even after 6 months, second guessing along the way.

She is still in love with her ex. And, he still has some feelings for her, or else he would not have taken care of her when she drank too much, in-fact it seems to me that she possibly drank "so much" because she was in a place where her ex was, and it hurt... He possibly also felt guilty as he knew it was because of him.

Why does that last bit matter? Because, it means they know each other.

Don't continue to "date" past 4 weeks, or so... all you are is a handbag to someone who can't have a relationship for their own reasons.