Really? [Yep, he wouldn't have guessed that one. Eric can be kind of a dick. He'd say that Spike is a better vampire for not being a douche even though he lacks a soul, but he's willing to bet that would not be encouragement to Spike.
Anyway, back to the topic at hand.]
Look. She really likes you an' she likes you for who y'are. Soul or not. I don't think y'have t'change for her. I don't think she'd want that.