Covid Cancer live with ex.

[Fuckmyliferightnow]

I have cancer and having chemo, I live with my ex as we have a child, he goes out to his mates every night and has done since beginning of lockdown 1.
He also goes to a relatives one night, but he goes out every night.

He is putting me at risk, is making no effort to stay away from me and says I need to stay in my room.
I asked if he would go to stay with his mum (who lives two streets away) he won't go, I said he needs to stop going out or stay away.
He said work is a bigger risk as he has more contact.
It's difficult with him here because there has been a long history of gaslighting and arguments.
What can I do or say?
I don't feel safe, I have to shield and he is showing complete lack of regard.
Btw rules have never applied to him.
He just also said that's not as bad as it sounds and isn't that rife.

I'm at my wits end with him and his bullshit.

Report him every time. You know exactly where he is.

Well given that I ended things because he was sneaking around, I actually don't think he's just going to his mates, he's lied so much over the last 18 months about his whereabouts.
He could be going anywhere.
Also I don't know if I should be wasting police time, it's every night and he won't stop, for anyone.

Are you married? Who owns the house?

Not married, joint own the house.