Because this is a
long distance relationship, you got to understand the high risk and
the much-less fulfilment gain from the relationship. I don't know
how fast it took you to be in a relationship with her, but surely,
I doubt it was long enough to see certain critical factors or
personalities about her to make a better judgment for
yourself.
Regarding her ex's matter, it's kinda obvious that she is a woman
that doesn't really make decision OR simply a woman that is still
dwelling in her past. Both factors contribute to such behaviour of
maintaining current status quo, with her ex, even though it is
completely nonsensical. Your relationship with her is a perfect
position for this nonsense to continue - imagine if she were to
have a new KL bf, wouldn't it be a direct issue to settle
immediately... with decision and all that, instead of a LDR, which
is like easy to keep mum (to her ex), do what she always does and
remain attached?
I think if you are looking for a permanent, long lasting
relationship, you got to speak to her in regarding what she is
looking for. She may see you as an emotional transition, therefore,
before too much feeling is invested, please consider reality as
part of your consideration, for you don't go clubs and look for
lifetime partners - in the same way, when you are seeking
someone... and this someone must share the same vision as you and
not just a temporal thing. If it isn't, then either you accept the
deal or move on with it. A long distance relationship is already so
challenging and to date... many fail ultimately and
miserably.
If reality has shed some signs of complication ON TOP of a LDR, I
think you seriously need to talk things through - to understand her
mindset, your current situation and her emotional state.

Cheers