In the Fallout Boy song "Thnks Fr Th Mmrs", what does this line mean: !

In the Fallout Boy song "Thnks Fr Th Mmrs", what does this line mean: "He tastes like you, only sweeter" ?????

I don't understand what he's talking about.. I realize he's talking to a girl in this song but what does this line mean?

When you look at the chorus, it says "Thanks for the memories, even if they weren't so great." Then later, it says, in quotes, "He tastes like you, only sweeter."

What I think is that he's quoting what the girl says. That line gives a reason why the memories weren't that great, because she's most likely talking about some other dude she had sex with, and comparing that dude to the dude she's having sex with now.