It was right or you to run = It was right FOR you to run
Though "Ich lieb dich nicht, du liebst mich nicht" is similar to the saying, "I love him/her, I love him/her not." that's not what it's about. He's saying there's no more love in their relationship. "Und du meinst, dass nichts mehr geht" - she's telling him she won't come back and she'll never have sex with him no more. "Etwas gehen" means also having sex. So " And you thought... That there was nothing left, aha." would be better "And you're saying... there's no way back"
"Work hard in silence, let your success be your noise!"