I exploded at my boyfriend and really hurt him. How can I ever make it up to him?

I was frustrated with my boyfriend and life in general. Unfortunately, I channeled my anger at him and really hurt him in the process. How do I show that I am truly sorry? I have said it countless times, but how can I *show* it.
I exploded at my boyfriend and really hurt him. How can I ever make it up to him?
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