How can I access my old iCloud photos when my partner is using my email on her iPhone?

My partner has used my email for her iPhone, now I’m back on iPhone I had to create a new email and now cannot access my old iCloud storage which I am still paying for!

[Re-Titled by Moderator]

Original Title: years ago i had an iphowith photos on icloud which i pay for monthly, then i changed to Android. now im back with i phone but my partner has used my email for her phone, i cannot access my old icloud photos