What is a guy implying when he says “I want you to be mine” or “I want to make you mine”?

Anonymous
Is he implying it as a relationship like a girlfriend? Is he asking me to be his girlfriend or just stating he would want that? I am confused this guy I am talking to told me that a few times but when I asked him if he was asking me or just saying it would have been nice (because I moved to another city in the south), he said I’m telling you. So I assumed he wasn’t officially asking me to be his girlfriend. Now just yesterday he wrote me a very long message saying I wanted to tell you I want you to be mine, before saying why he likes me (he’s told me he liked me before though). Was he officially asking me to be in a relationship?
What is a guy implying when he says “I want you to be mine” or “I want to make you mine”?
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