Re: Something on mind....
This is so sad, and I have to say this- In the past few days I heard about 3 divorces in people we know. All of them over issues that were resolvable, but things escalated and both parties got mad and it happened, then they regretted it later (well, atleast two of them regret it now). It just makes me so sad :( esp. considering the fact that they're all good people.
Your question about trusting- I don't think there's a way to trust people, like Niksik mentioned, what you can do is trust Allah SWT and hope He brings the best people forward for you i'A. Stuff like this incident happens and at that time we may not understand why it did occur, but may be there's something better on its way for that girl. Tell her to keep her chin up! :)