Hi there!! Don't worry!!! I have just introduced two new cats to my bunch of four....one of the originals four Bod, (my special baby) is doing the same thing, well, not growling at me, but has suddenly become less affectionate, this has happened before but with time and LOTS of reassurance that the first cat is still your "special baby" things get sorted out. I think they do feel a little "put out" at first when you bring a new cat home...also remember its pretty stressfull for them, there is a new smell in the house and someone else to take "mums" attention!! Just make sure you give him lots of extra loving and few extra treats won't go astray either!! Try not to change his routine as much as poss, and mostly, give him time, keep fussing him like you used to and also some "private time" away from the new kitty. Smooth him and talk softly to him when he starts to growl....he will stop eventually!! All the best and let us know how it goes!!