He threatens to leave me, advice?

my boyfriend and I got into a small argument and he threatened to leave...he said that he's tired of me always acting out on him apparently and when I told him that I didn't appreciate his threats he seemed to back off and told me that he would contact me later if I wanted him to...he did and it all seemed fine but I'm really hurt and now I don't know if I want to stay with him cause of that...i just can't get over how he reacted I guess. what should I do :(
He threatens to leave me, advice?
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