Why is Keshia reluctant to ease up on her relationship with Andy even though she would like to?

Andy's going through a tough time in his life, and his depression is getting worse. As a close friend, Keisha wants to be there for him, but she finds Andy's fraught mental state too much to handle at times. So on the whole, she thinks it's best if she eases up on her relationship with Andy. Maybe that way he'll have some much-needed space where he can grieve in peace.
But Keisha's reluctant to make that fateful step due to Andy's obvious suicidal tendencies. Keisha's not the most sympathetic person in the world when it comes to mental health issues; we see that clearly when, in English class, she criticizes Ophelia for being a "wimp" by committing suicide. But even she can read the signs; Andy's dangerously suicidal, and if Keisha eases up on her relationship with him, she's worried that it might just push him over the edge.