What should i do??????

So last night while over at my SO house, he made a comment that I caught, but I didn't say anything......we r technically exclusive FWBs, we do everything that a couple does, he just hasn't met my kids and we don't have a 'lable'......we have been seeing each other for awhile, but he had a bad break up before me and wants to take things slow....I get it, I won't push, but he knows what I want. Well last night while him his sister and I were talking, he referred to himself as my bf....not a big deal, but I smiled so BIG on the inside. Idk if he just referenced himself like that due to the topic of conversation, or just because??? I don't want to say anything, because sometimes I tend to overthink things and I know there will be slight disappointment if it's the latter reason. He says I can talk to him about anything, I just don't know what to do, possibly b disappointed or possibly taking baby steps???