Why would my boyfriend call me "mom"?

Anonymous
We've been together for 5 months now and known each other for a year. We've passed the initial phase and now we're just comfortable being with each other. My boyfriend has this habit of having me cuddle him, and he'll look up with puppy eyes and call me "mommy." I never thought anything of it since I thought he's just joking and fooling around. But last night when he fell asleep cuddling, he called me "mom" couple times, in English and in his native language...sleep talking? Of course, when he woke up this morning he completely denied it and just laughed it off. He never felt much love from his mom, and he has admitted before that he's always looking for a motherly figure in his life...do you guys think he sees me more as a caretaker rather than a girlfriend? I'm just really confused.
Why would my boyfriend call me "mom"?
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