Long term boyfriend says he hopes I die soon so he doesn’t have to deal with me anymore. What should I do?

It’s not simple because we have 5 kids together and are living together. We have been together for over 12 years. I know I’m not perfect and that’s the reason we argue a lot. I am financially dependent on him so I can’t just pack up and leave. I’m heartbroken honestly and believe he is probably cheating for him to say something so malicious.

Long term boyfriend says he hopes I die soon so he doesn’t have to deal with me anymore. What should I do?
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