You should realize that threatening to end a relationship is an incredibly cruel thing to do. He's no doubt very hurt and feeling vulnerable. He may one day forgive you, or he may not. If you haven't apologized, you need to, and you need to never say something like that ever again unless you mean it. You need open and honest conversation about your relationship, where you both feel that you are and where it's going, and how your mental illness affects that. Perhaps marriage counseling might be helpful.
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