How do you know a marriage is over?

Sinead O'Connor's fourth marriage lasted 16 days. Is that long enough to know it's not working?

Anna Foster takes your calls on whether you persevere in relationships - or cut your losses and move on.

Call 0500 909 693 (free from most landlines; other networks and mobiles may charge). Text 85058 (charged at your standard message rate). Email [email protected].