My question involves a roommate in the State of: Ohio

My best friend, her boyfriend, and I are all living together in a rented house. We signed our one year lease back in August 2010. It is now May. I have been miserable for months from all the tension in the house because of their relationship issues. Finally, the boyfriend and I got into it through text messages when I was away for the weekend. He was completely rude with intentions of talking like an adult, but then told me to move out. He precisely stated "Yes move out and you will never have to pay anything ever again". I took that in stride, made a plan, and decided to move out at the end of this month. According to the lease we all signed, nothing can change without a modified lease. I made composed a modified lease, had it approved by the landlord, and asked them to sign it. Now they are refusing. They want me to move out, told me to move out, but want me to pay out the remaining months left on the lease. How can he tell me to move out and have no consequences to his actions? I have all of the text messages saved, will that do anything for me? I am moving out regardless if I have to pay the remaining months on the lease or not. As far as the utility bills go, they are not in my name, are not on the lease, am I responsible for them?

Do I need to get a lawyer? What is the next step I need to take to get this in control? I refuse to let this idiot run me out of my home, where I pay to live, and expect me to pay him!

I need help ASAP.