Everything and anything. Once you've been together a while, sometimes it's nice to just be in silence together. You don't have as much to talk about because you know all the basic things about each other and you know what they like to do, etc. It's more about being comfortable with each other. You talk when you want, don't talk when you don't want. You know you are with someone you're meant to be with when silence is perfectly fine. My fiance is huge talker and i am not as much. But, all in all, I feel comfortable talking to him about anything whether it be something i'm worried about,current news, friends, family, and just random things that may come up.