Labels. Everything is left undefined, you can’t even say you’re dating someone you’ve been hanging out with for months because it’s not entirely true but it’s not entirely false either. You can’t say if he/she likes you because they haven’t really confessed that to you yet and you can’t say that you’re not single, because technically you are.
They won’t hide from you in fear of rejection. They will tell you all their secrets that weigh on their heart at night and will bare their naked soul to you. And they won’t do it because they have to. They will do it because they trust you.