Presumably you are in contact with your teenaged children and his other children ? I'd have a chat with them, make sure they are giving him support. He may not have another partner, but he does have a family who should be supporting him. It shouldn't be up to you.
I have a similar marital situation to yours, and to be honest I'd be reluctant to get too involved with my ex, even if he was sick. I'd give him a call and check on him - but I wouldn't be going over there and spending time with him. To each their own, of course, but you have a new partner to worry about, and your ex is an ex for good reason.
My OH has spent too much money


