I think he's saying that he met someone new that he can really fall for, and is in love with and because of that he's leaving his past behind for her. Unfortunately, though, he caught her cheating and he's saying in the line:
"now listen to me baby if you can't sit still,
I know your sister will.'"
"Sit still", to me, means stay committed to the relationship and he's threatening go for her sister, which probably means she has her eye on him as well. And the last part:
"There ain't no blood on my hands, love,"
She probably got bad about that last remark, and he's reminding her that she's the guilty one here, not him.
I think he's saying that he met someone new that he can really fall for, and is in love with and because of that he's leaving his past behind for her. Unfortunately, though, he caught her cheating and he's saying in the line: "now listen to me baby if you can't sit still, I know your sister will.'"
"Sit still", to me, means stay committed to the relationship and he's threatening go for her sister, which probably means she has her eye on him as well. And the last part: "There ain't no blood on my hands, love," She probably got bad about that last remark, and he's reminding her that she's the guilty one here, not him.
Just a few thoughts. :)