How do i make my dad not walk out on the family?

My mom and dad dont have the ideal relationship, they never talk to each other, my dad sleeps in the room downstairs and spends most of his time at work. I know that this may sound like a horrible family, but it works for us. Yesterday my mom and dad got into it pretty bad and my dad packed a couple things and left the house. He came back at like 10 that night and he slept at the house. I opened his trunk today and i saw suitcases and he says hes looking for a house that me and my sister would live in together, im sorry to say but if i had to choose, id live with my mom just because i get along with her better. It took my aunt, uncle, grandma, sister and myself to convince him to come back home and i made a huge deal by crying in front of him and he agreed to stay(we have his family over for the week so he has to stay here). Im worried that after the week he will leave again. How can i make not abandon us again? I never thought it would hurt so much as when i found out my dad wasnt coming home. Im sorry to give you my life story but i just need to find a way to keep my family intact. My mom and dad are both stubborn, but iv never seen my dad so angry and hard headed, usually he is quiet and stays downstairs, he comes home from work, eats, watches tv, drinks tea and goes to sleep in the room downstairs. My mom is upstairs on her computer all the time and my sister and i are in our rooms. we try to spend time together as a family but its just so damn awkward when your parents are ignoring each other right in front of you. I need to change myself so my dad will stay. What can i do, im desperate:(