Fortunately, as you can see, they sell beer there. So pick some up for you and mum.
Some quick exposition: Gary always buys lunch at this same gas station every day, so Laura placed this break-up ad there because she knew he would see it. So right away, we know we are dealing with two fairly crappy people. One of whom, Dan, eats at Exxon every day and the other, Laura, is screwing Gary, involved Dan's mum in the breakup first, and then dumped Dan with a note that was read by thousands of hungry/gas guzzling bystanders. Dan's crimes seem slightly less severe in comparison. Granted, he may well be a total jerk, but did Laura really have to fill his favorite gas station with bad memories? For shame, Laura, for shame.