What information can my spouse access without actually accessing my phone?

My spouse has recently changed our account to only include their name. Effectively cutting off access to billing and other information. I have not lost my phone or the plan it was on, but only they can access the online billing. My question is what exact information can they get from that? Can they read my texts? Can they learn my location? I assume they can see call records and likely who and when I texted someone. I'm concerned for safety as we are separated and don't want them to know where I am or what I'm discussing with people.