He broke up with me

Me and my boyfriend had engagement plans, were planning for children and live together. Recently he’s been distant and I kept asking why and if there was anything wrong and he kept saying no and it was all in my head.

He’s been going through some health issues and potentially has a life threatening condition return.

He says he knows how he was last time it happened. volatile and not a nice person to be around and he says he can’t put me through that.

I’m so heart broken because I’d do anything for him and want to be there for him but he keeps saying it’s easier if we’re not together.

I don’t know what to do. Please give me some advice!