My boyfriend and I of 7 years split HELP?

Ok so i am in the situation where my boyfriend and of 7 years are splitting.We also have 3 kids together.Now i have to say we never married we were engaged but it never happened though.Anyway things just arent like they use to be we do not get along what so ever we fight constantly.Its to the point where my 6 year old covers her ears and says i cant take it anymore.There are other factors to but just dont feel like getting into it anyway we have a house together so i am still here living with him and our 3 kids.The plan was for him to keep the house and our 3 kids and i would get a place of my own.He feels this house is his because hes the one thats worked i have always stayed home with the kids.There is no way i could take my babies i have no job experience due to staying home with them.I am not going to be able to get a job that pays good enough to get a house as big i need.So as i said i am living here with him still but he is making me feel like i am such a burden to him.He keeps saying he doesnt understand why he still has to pay for everything for me.He has asked me before why i cant just move out and go on welfare to find a job to get back on my feet or why cant i just move to my moms.I feel he owes it to me to help me till i do get on my feet instead of just throwing me out like a piece of trash. We were together for 7 years we have 3 kids together.He just makes me feel totally horrible he never wants anything to do with me either other than when it comes to he just been so mean and ignorant to me since the break up.He is acting like he is a teen again going out and hangin out with his friend which is fine but he will leave me here all day somedays by myself with 3 kids.Also he has been seeing some girl im like geez im not even gone yet its just sooo dissrespectful if you ask me.So what is a person to do in a stuation like this i just feel soo stuck???Any advice would help