Is he using me?

So i talked to this guy for like a week but it didn’t really work out but we would Snapchat every now and then but I haven’t talked to him for months. But today he snapped me and asked what I was doing, I was in school and he said he wanted to hang out but I couldn’t bc I was in school obviously and when I asked why he just said bc he wanted to do something.... my guess is that “something” was sex. I think he just messages me when he’s horny and wants to have sex . What do you guys think?