What if you dont hear from someone you love in a long time?

Well I have been with a guy for almost four months now. He isn’t the most innocent person out there. He has had problems with crime and has disappeared on me before. It’s been three weeks now and this is the longest I have gone without one word from him. His kik is disconnected and he does not have a phone. With all this happening I have no other way to get in touch with him.I am very lost and i have no idea what to do now.