Breach of lease agreement?

my "slum lord" refused to fix anything in our house. there were 4 broken windows that were there when we moved in, (that he said he would fix), my dryer vent was made of cardboard, there was an ant nest in the bathroom wall and the sheet rock around it was rotting, not to mention there was a friggin gas leak. with the gas leak, i called the gas company and they put a warning sticker on the stove saying that it needed to be replaced because it was extremely hazardous. if fixed, it must be done by an appliance mechanic. well, the idiots took it upon themselves to try and tinker with it. they made it worse.. not only was it leaking gas, but it was putting off carbon monoxide. i had the gas company out to my house in 20 minutes to inspect it. i asked him if he would talk to the idiots i was renting to house from, and of course he said, "sure". he told them that if they continued to try and fix it themselves, they would be fined and they would shut my gas off. THEY STILL DIDNT LISTEN!!! we ended up moving out because we feared for our safety and the well being of our 9 month old daughter. they told me that i breached the lease by moving. ok, technically, didnt they break it by refusing to fix anything and putting us in danger? please, i really need help!