PLEASE HELP

I love my fiance with every ounce of my being. When I love, I love completely. I love him. I love our kids. I love our families. He has two kids, i have one child and we have an angel baby looking down on us from Heaven. So to sum it up, we have 3 of our loves here with us on earth! I'm only trying to paint the picture here. I never actually say your kid or my kid. They are ours. We are family and thats it.

He has full custody and so do I. His ex is hardly involved and my ex took off to the UK and haven't heard from him since I got pregnant.

Anyways. My fiance and I had a mess of a fight. The fight stemmed from his ex regarding now wanting half the house and wants to take him to court for the money. Ages ago, my fiance told me that it was his home that he purchased with his dad. And that was the end of it. Now this news has surfaced that apparently his dad helped out but it was actually his and her purchase even though she never moved in because they broke up (it was a brand new build that was bought pre construction).

I didnt understand why he couldn't have just honestly told me that at the beginning. And we had an argument about it because despite being in his and her name (not his and his dad) i have been living here and contributing to paying her mortgage. Im upset that I was left in the dark. Because again please note she never did move in. The house was bought, then eventually built about 16-18 months later and nearly 9 months before completion of the build, they broke up.

Now as a result of our argument here tonight, he told me im ridiculous and hes done with the nagging and my attitude and said we are over. And he jumped in his car and left. Again, i love our kids. But legally, they are not mine as I have not adopted them or become a legal guardian or anything. If we are in a relationship then of course it is joint willing responsibility. Now in rage he has said we are over and left the house with me, my son, and his two kids with me. Without asking. Just up and left them. I dont know what to do.