Andrew Brady mentioned in his blog post that a while ago a bad story was coming out so to stop it she gave an interview about her depression.
I wondered if this was anything to do with him naming the Mermaids charity as the cause on the charitable fund he set up. Perhaps the papers were going to release personal info about her family so she sold stuff about herself as a trade off.
I think he has some mental health problems too. In fact I'd lean more toward some sort of personality disorder diagnosis for him that I would have done for Caroline.
That said it is entirely possible that at the time they were together that her friends/family were not aware of the extent if her illness and only he saw it.
Also, someone mentioned earlier about her friends statement seeming like he knew what she was planning. I have no doubt at all that those close to her knew she was a suicide risk, hence her mum's comments thanking those close to her for trying to help keep her safe over the last few weeks.
I also think that Danny C's (the rugby guy) comments about her voice message saying she had to plead guilty are also relevant. Someone on the earlier threads said that ITV would only keep her job open if she pleaded not guilty. Presumably finding out that the case was going to court and (I'm guessing) being told by her legal representatives that they recommended a guilty plea would really have put her future career at risk.
Obviously it's not just this one situation that caused it, these things are complex and I got the impression from her book that she'd been finding things hard for a long time.