“It’s okay to cry, you’re safe here”
I think this is probably one of the best things you can hear from your significant other. It’s their way of saying “I want to feel whatever you’re feeling” and “the way you feel isn’t going to drive me away”.
He wasn’t getting mad that I was crying into one of his favorite shirts or blubbering like a little kid; instead he told me this and held the back of my head and stroked my hair.
I think the most important ways you say “I love you” isn’t saying it that way at all.