What kind of experience is it to have a boyfriend with delicate mind?

I know better than her where to put things, knowing when she wants to be alone and doesn't want to talk, knowing when she can't joke, knowing what she is worried about, knowing what she can't do when she is depressed, knowing what she is struggling with but won't tell, pretending not to know even if she knows the secrets in her heart, because he knows something that I know will hurt.