You could use a vpn that supports wire guard and tunnel it through https. But that’s probably a bit technical. If you have an android phone he may have installed an app like Cerberus, or perhaps he has a pihole installed on the network and can monitor your traffic that way.
If your using your phone not connected to the WiFi network he won’t be able to see the traffic.
What would work for you in this case would be to use a HTTP or HTTPS proxy.
You could use a vpn that supports wire guard and tunnel it through https. But that’s probably a bit technical. If you have an android phone he may have installed an app like Cerberus, or perhaps he has a pihole installed on the network and can monitor your traffic that way.
If your using your phone not connected to the WiFi network he won’t be able to see the traffic.
What would work for you in this case would be to use a HTTP or HTTPS proxy.