Has my phone been hacked?

Hello, i'm new here and hopefully someone will be able to help me.
Maybe a little TMI, but just so you get the whole story, I started searching through my phone because my partner has mentioned some things in jokes that I've been talking about with other people on my phone via calls. Things I've only then said. Shrugged it off as a coincidence, but then I started checking my phone data.
Among dozens of wifi networks that I recognize, I have one that i 100% never used, neither was I ever at that caffe place, and even less could have been able to use that wifi, but- my partner actually spends a lot of time there.

Does this mean that my phone has been accessed through another device that was using that wifi? Or could it be in my networks only because I've been talking/texting a lot with that device that's often connected to that network on messengers?

P.S. I found it searching in Data Usage > Restrict Networks

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