i take it as he left her because she can't let go of the past. she keeps bringing it up, and he wants to her realize what they have together is right now, not back in high school. and she keeps bringing up past lovers and how they've "touched" her, and he finally has enough and breaks it off. it's also self-deprecating, saying on how he wasn't that good for her anyway. he wants to make it mutual (the breakup), so maybe it won't cause as much pain, but ultimetly he just gets drunk more, and goes back to his "wilder" ways.
i take it as he left her because she can't let go of the past. she keeps bringing it up, and he wants to her realize what they have together is right now, not back in high school. and she keeps bringing up past lovers and how they've "touched" her, and he finally has enough and breaks it off. it's also self-deprecating, saying on how he wasn't that good for her anyway. he wants to make it mutual (the breakup), so maybe it won't cause as much pain, but ultimetly he just gets drunk more, and goes back to his "wilder" ways.