So you and he were acquainted with each other for 2 years - but you haven't heard from him in 4 months. 4 months seems like a long time to not hear from someone. If he has chosen not to respond to you, then likely you cannot make him change his mind. Has something happened to him? Maybe he found someone else in his new location? Yes - you could try to call him. And that might be a way to speak with him and get some answers. Look after yourself - and it sounds like you are making your own plans about jobs and other activities.