I agree with Itsnikki about this song being about unrequited love. The guy is leading the girl on by giving her glances and noticing her body when she does things like "lower her collar". I think that the girl makes a common mistake by being flattered by his attention and thinking that she could be winning his heart instead. I think he might even be taking advantage of her feelings so much that he gets physical with her. Or maybe, rather, he's just using her as some sort of trophy girl that makes him look good. Either way, I think that's why he feels so bad about it and says "now you're murdering my soul".
I agree with Itsnikki about this song being about unrequited love. The guy is leading the girl on by giving her glances and noticing her body when she does things like "lower her collar". I think that the girl makes a common mistake by being flattered by his attention and thinking that she could be winning his heart instead. I think he might even be taking advantage of her feelings so much that he gets physical with her. Or maybe, rather, he's just using her as some sort of trophy girl that makes him look good. Either way, I think that's why he feels so bad about it and says "now you're murdering my soul".