That is pretty much what I do.
Ask first if they have time to listen. I rarely ask them to, but when I do they always say yes. But I feel that, if the bestest friend that I trusted the most would turn like this. The others would do the same?
I don't know if people usually feel it is boring/bothering to listen to someone speaking of their hardships? I don't want to put them trough that if they aren't doing it truly willingly. :x