Depressed boyfriend. What should I do?

My boyfriend suffers from severe depression. He refuses to get some help. I tried to be a good listener for a year and a half, even though he treated me poorly most of the time. I let him because I understood that those who are hurting hurt. Yesterday, I gave up. I have no strenght anymore to tolerate such behavior but I feel bad for me giving up on someone I love. What should I do? please help!
Depressed boyfriend. What should I do?
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