The next sentence of the lyrics is how to get drunk when you are too awake. Let's take a look together. Your love will make me drunk/I don't care/how to get drunk when you are too sober. Guess means that your love is strong and mellow, which makes me intoxicated and lost, but this intoxication is not a sober move, so even if your love is strong, it really doesn't matter to me.
Extension:
Dear John letter is synonymous with English "dear John letter". The so-called "dear John letter" refers to a letter written by a woman to her husband or boyfriend to express her breakup. It is usually written when the screenwriter has another love, and often the screenwriter can't or doesn't want to tell the man in person. On the other hand, if it is a letter to his wife or girlfriend, telling them to break up, it is called "Dear Jane Letter".
(From Baidu Encyclopedia-Dear Jonh Entry)