a new dog not a good idea?!?

Hey guys this is quite long, and i may sound like im being selfish but im so annoyed!

i have 3 cats and my boyfriend has 1 dog, one of the cats is my boyfriends dads, because he was moving into a place where he wasnt allowed cats, and the other cat i bought to keep that one company, and the 3rd cat ive just decided to keep cause my boyfriend bought it in cause it was pregnant and was being chucked out, so ive bought her 3 kittens up and rehomed them, and i decided to keep the mother, my boyfriend bought back, well he has a dog a staffordshire bull terrier, we are living in a flat and been living here now for about 2 years and he bought the dog knowing we wasnt allowed it in the tenacy your allowed cats, but not dogs, so ive had to put up with the dog, knowing if we get reported theres a chance of us getting kicked out

well yesterday he went behind my back and went to view these staffy puppies, i asked wherever he put a deposit down, and whats the man like he said he hadnt and the bloke is nice

well later that night he told me the truth, hes put a deposit down and he has a week and abit left to collect it, the man has only bred these staffys for the cash which has annoyed me alot !

im just so annoyed i dont know what to do were not even allowed a dog where we live let alone 2 !

and were looking into putting a deposit down for this house with a garden well she was fine about the knowing we have dog, she just didnt want it going through toilet training and teething well we will have a puppy living there and hes on about hiding it !?

am i the only one with common sense, can some one give me some advice please on what to do!?

thanks x