It’s completely up to you. Sometimes keeping that contact will keep you stressed and drained even though you’ve took a step away, or sometimes you might want to just know he’s safe.
I know when I first left my partner years ago I cut all contact, for my own wellbeing as even a text message just upset me and it wasn’t doing me any good. He got sober on his own and eventually we kept in touch, when we were both a bit stronger mentally. But you’ll know what you can handle and what’s best for you.
Wishing both of you all the best x