It does get easier hun. Its like all of a sudden they just forget all about it. All I can suggest is dont take the dummy off him yet. It can be a big thing for them losing the bottle and he would find comfort in his dummy atm. Just give it a couple months in between atleast.

Just lots and lots of cuddles and explain to him he is a big boy now etc. Try not to give in... otherwise all your hard work so far with it is undone.