Need help

Ok so I’m with this guy and we’ve been together for 16 months and it was going great but for the past few months he’s been really different and distant and we’ve talked about it and he said he was going to change. But get this...nothing has changed. Sometimes there are days were it feels like everything is ok and then others where i don’t hear from him for a day or two. We are both 16 and unemployed and don’t do extracurricular activities and idk what to do.