buying a house on land contract!?

Recently me and my wife were renting from a guy that would later be called my friend. He had a string of property and built a new house in between the house i was renting and the oold house he lived in. So we signed a land contract through a lawyer, and he agreed to finance us for 2 years. Well we've been in this house now for almost exactly a year. But before we moved in when he gave us the tour and told us about the house, he failed to disclose about a dozen things that were wrong with the place. serious things like leaking roofs and flooding basements. And on top of it all, we have an outside electric socket thats located by our driveway, and a hose connection that faces his property. Well he parks his car in our driveway and uses our electric, he has taken our hose and ran it to his yard to water his lawn, he drives through our yard daily and tears up the grass. He's went from a nice guy to a real piece of work. I DO NOT wish to live here, what happens if you default in PA.