My partner is missing and im really worried

My partner has been a a hard drug addict for many years, He's also been to jail for 2 months before but now he's totally clean like he even got closer to god and was giving me advice and really cared for me. he's been to rehab alot of times and was diagnosed with schizophrenic symptoms due to drugs, he told me that. He's been through electric shock therapy and told me that people think he's crazy. To me though, he wasn't, maybe in the last couple of days he started to drift away from our conversations on the phone, for example, whenever i bring up any topic we'd talk for hours not reaching any useful point of the call, he also has an obsession with numbers, that they have a certain message. which is fine though i don't think its that much of a delusion maybe it's just something he thinks of.. right? Im really tired and idk what to do anymore and idk if i can take all of this, I'd never want to give up on him but what are the chances that he's the one who gave up on me.. maybe even ghosted me? I told him last time we talked (15 days ago) that i need to have a real talk with him and he didn't seem to like that, he didnt talk seriously, he kept bringing up different topics and i kept telling him that i dont understand what he's saying.. maybe that made him hate me..? he told me he needed space and that he cant talk rn, when i asked him why? He literally said "i just cant baby, because when they come they come when they go they go" he's been gone for 15 days. His Whatsapp not receiving anything, Facebook and instagram aren't either and his number isn't even dialling it gives me "call ended" before i can reach him. I thought maybe he ghosted me, changed his number, and has all of my chats on archive/ignore mode on social media. But he never posts anything.. he followed a relative of his like a week ago but nothing more.. keeping in mind that he used to post everyday.. idk what should i do? Should i contact his parents? They dont know me.tho and they might think im a threat.. i dont wanna introduce myself like that.. i was thinking of calling his friend but many guys told me no that's against bro code and he'd be upset preferable not to.. I'm really frustrated..