Army guy still wants to be with me even though I have a boyfriend, should I be worried?

So as the title states I have an army guy who I knew before he went into the army and he recently commissioned my art but after he kept talking to me and it lead to him confessing that he's obsessed with me and I told him I have a boyfriend he still stated that I can have both which is crazy and he just seems to be very clingy with me and I'm not sure what to do because he's a very good person, but I know he is also introverted and many of his friends no longer talk to him so.

Army guy still wants to be with me even though I have a boyfriend, should I be worried?
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