Why is my boyfriend verbally abusive to me when he's drunk?

Every once in a while, when my boyfriend has had copious amounts of liquor, the flood gates open and he decides to release everything that has been bottled up over the two year duration of our relationship. He usually "breaks-up" with me, passes out in the guest room, and immediately apologizes the next morning. I accept, but still replay everything he said to me. I can't help but wonder, does he really mean these things? Is it me? Should I put up with this once in a while explosion, or leave him?
Why is my boyfriend verbally abusive to me when he's drunk?
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