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Aww, I feel for you lah! A few of my mum friends went through this jugak around that age, sometimes babies just decide they prefer direct latching or they're going through a phase. Have you tried warming the bottle a bit more, or maybe switching the teat size/type? Some babies also prefer if you express into a cup or spoon instead of the bottle (I know inconvenient but sometimes works!). If he's still gaining weight and wet diapers okay, it might just be a phase, but I'd still check with your doctor to make sure there's nothing else going on, better safe than sorry kan. Hang in there, sometimes babies change their minds after a few weeks!