Teenage daughter versus moms boyfriend

My boyfriend and I have been living together for almost 4 years. I have to teen daughters, ages 14 and 17 who live with us full time, aside from bi monthly visits to their dads house. My oldest daughter and I tend to butt heads alot and we do argue, as all teen moms and daughters do. We have done this for the length of the four year relationship. Well, about 2 months ago, my daughter and I got in a pretty heated argument and my bf actually got involved, which he has never done before. After the argument he packed his clothes and moved to his parents house, which is where he still remains. I love him and he wants to move back in, but the tension is so intense when he is just visiting the house and my daughter is home. He wants us to continue to date but live seperate...after four years, I cant get used to that idea. Why did he leave after that one argument? And he left 2 days before our rent was due and all of the utilities as well. I was in college at the time and had, and still have, no job. My ex husband stepped in and has paid all of our bills, along with his own bills and his new families expenses, but what if my ex wasnt able to do that? How can someone walk out like that? And now he wants everything in the house...from furniture to towels! He still tells me he loves me, but he cant live with my daughter. Im so torn...not to mention, worried about him taking what I do have in the home. What do I do?

i think he was looking for a chance/reason to leave.. and getting involved in an argument was one opened door where he can walk out to. does he have work? why did he go back to his parents's house? do you think this is a sign that he is not responsible enough to live for himself, and more so-with a girlfriend who have teenage kids? be thankful for your ex husband who helped you with your bills. and now why does your boyfriend want the things in your home? are those his? then let him have it. this may be a sign that he doesnt care about your welfare anymore.