What does it mean when a guy say 'you will always be mine'?

patsi
My boyfriend text me that after I stop answering the phone to him,he said something that made me upset. I didn't break up with him just didn't respond to him. So he text me and said "ok your ignoring my call I don't know why hope your OK baby you will always be mine. Is he trying to say he won't let me go.
What does it mean when a guy say 'you will always be mine'?
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