Anyone else have this problem?

My baby is EBF. He usually eats every 2-3 hours 4 max but whenever I leave him with a bottle he'll go like 6 hours without eating because he prefers me. I've tried different bottles and he doesn't seem unhappy when he goes that long without eating but I worry when I leave him because with me he eats more frequently. 
Thoughts?  Suggestions? Thanks!