I bring it up when I need to. I write her ridiculous letters full of feels on occassion just because I have to get out what I'm feeling because I don't understand it. She reassures me everytime I ask if she's going to be there or is there even if it's more than once a day. She doesn't just reassure me in word she also goes over the ways that she has shown it. We have a long therapy road ahead of us and for my treatment it greatly depends on trust and the relationship, so I'm sure in 4 years from now if I need reassurance daily again, she'd gladly give it.