I don't know anything for sure...Do I?

So I've been thinking. Do I even really know anything for sure? No I don't I can't ever be sure of something. Like I can never be sure how long a relationship will last or who I can really trust. I've made that mistake of trusting people well it was a stupid mistake. Ok so there is one thing I know for sure. I know that I've learned a lot in my life so far and I have a lot more to learn (hopefully).