Don’t want this relationship anymore

So I’ve been with my fiancée for 4 and half years now, we live together with my 14 year old son.

I love him but I’m not sure I’m in love with him any more, I told him back in January that I wasn’t happy. And since then I’ve told him again. We never have sex any more and if I bring it up then he has a go at me. I don’t think we want the same things any more. I really want a baby and he doesn’t seem interested. He had a go at me last night because I brought him a different ice cream to the one he wanted as they didn’t have the normal one.

I pay all the bills, do all the cooking,cleaning, shopping, housework etc. I don’t have anyone to talk to my family live 130 miles away and not seen them in 3 years only my mom a year ago.

I really don’t know what to do both our names are on the rental and it’s not like I have any where else me and my son can go.

When we’ve have arguments before and I threaten to leave he would say things that if I left then he would hurt himself or make things up about me