Boyfriend says "i'm addicted to you" meaning?

My boyfriend and I have been together for 10 months. we've been having sex lately. After our 3rd tym, I've noticed my boyfriend become more sweet and affectionate towards me. He keeps say "you're mine and I'm yours" and "i'm really crazy for you." What does these phrases mean? Is he like that just because of the sex or it's something more?

P.s. we only have sex once a month.hehehe

Thanks for reading and helping me out. I'll answer yours also.
Boyfriend says "i'm addicted to you" meaning?
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