Why do some people with high IQs struggle in grad school even if they breezed through earlier education without studying much?

How do I go about a mental health conversation with my boyfriend? I need time for myself but he wont do breaks or wait for me if we break up. I need to get better by on my own but I know it will get worse if I lose him. What do I do?
Have you ever regretted not taking legal action in a divorce situation? What would you do differently next time?