Ditto what Laurie said.
If you can't go 90 days with no contact, that means you might be kinda... ADDICTED, yourself.
That's not the reason his sponsor suggested no contact, but if you focus on getting your own recovery going during those 90 days you will be in a much better position to cope with whatever comes after that--good, bad, or unknown (and, really, it's ALL pretty unknown, even after 90 days and good progress).
Welcome, you came to the right place.