A friend in a sticky situation

Rachael
A girl I work with has 3 kids with the same guy. They have never been married, but they've been on and off for 13 years. He doesn't trust her whatsoever and I see it continuously hurt their relationship& their children. It makes me hurt for her. 
​Her boyfriend told her that he couldn't be with her anymore because it wasn't ever going  to work out because he doesn't trust her. I watched her cry tonight and it made me very upset. 
​Do I tell her my opinions on the whole situation or keep it quiet?