What do I even do now...?

[Karla]

Okay well me and this guy have been seeing each other for about 4 months. The first time we hung out, we hooked up. I didn't expect much from the relationship then, but he kept on. We continued to hang out, and occasionally we'd still do physical things. But usually we'd just laugh and be silly and just generally enjoy each others company. He's a real gentleman and all, but we aren't dating. He says it's because it's easier for us to get hurt if we have the title of boyfriend/girlfriend, but I don't get that. He certainly doesn't have a problem acknowledging me in public or anything, and everyone knows we're a thing, but he won't take pictures with me or acknowledge our relationship on social media. I'm not really TOO concerned about the last part, but it still kind of makes me think I'm being used maybe. My question is, what is your opinion on what's going on? Any and all advice would be appreciated!!