He told no matter where I go in life I will always be his. What does that mean?

I got into a fight with this guy I'm sort of on and off with and he kept telling me not to leave because I will regret it because he has options sending a pic with six condoms on the floor. I told him I fed up with him and that he can go fuck himself and that I have better options too who treat me better but that got him angry for some darn reason and he said no matter where and what I do in life I will I always be his. Not to mention the daily text saying "my whore".
He told no matter where I go in life I will always be his. What does that mean?
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