How to tell if my phone is tapped/has recording device on it?

I think an ex may be tapping my phone. They know things they shouldn't know, are popping up at weird times in my life to do the perfect thing right after I've just talked about it. The thing is, it wouldn't be through tracking my data, internet usage, or even texts and phone calls. There are things I've only said in actual irl conversations that they would have needed to hear. The only objects that have been consistently with me …

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