So much for my happy family..

I have an older daughter (15) from a previous relationship and now due with my 3rd from my now 9 year relationship next week..I was just asked by my fiance if I ever thought about what would happen to the house, kids ect if we split up and how I should pretty much start thinking about being a single mom again back on the bus with 4 kids 😳..all because him and my oldest have some issues..idk y'all I'm so lost I'm trying to keep the peace and I was so excited about the birth of my daughter but I guess now I have to plan on possibly being a single mom..no I don't care to get into what the issues are and I'll always choose my kids over any man that's never a question..I now no longer want anything from him and just trying to figure out my next steps...