How do you all deal with your insecurities in a relationship?

I’ve been dating the best person I’ve ever dated these past five months. He gives me no reason to feel insecure, but I find myself battling my own demons. Mainly I find myself wondering if i am as important to him as he is to me, though I’m sure we all have our own unique insecurities. How do you all keep your hang ups at bay so you can just focus on getting to know each other, enjoy the journey, and see how it all shakes out?