My opinion........ don't say it to her. If she's not saying it back, you're reminding her that she doesn't have those feelings right now.
M 19 years, MC for 8 months, DB'd for 8 months 4 kids; 18, 15, 14, & 10 I was never meant to be a doormat. It took me years of therapy to become assertive enough to stop his abuse.