Why would you want to break up a 5 yrs worth of relationship
between a couple?
Aren't you a bit thick skinned to do that? If they are having
problems, let them handle it by themselves. Do not be a hero and
try to correct things as it will just backfire.
If she has feelings for you, she will come forth. Pouring out her
woes does not mean anything. I got lots of friends who will talk to
me about their problems.