I'm thinking of leaving my boyfriend with depression
Why do you want to leave your boyfriend who has depression?
Being in a relationship with him is really time consuming.
Even though it is hard to leave a relationship, especially one where one person is going through things, sometimes it is for the best. You can't help some people sometimes and need to help yourself be happy.
I just can't handle him anymore, you know?
Totally understandable. You need to look after your own mental health.