is my phone compromised? how can I figure out who's doing it?can I secure my phone?

I have a galaxy note 3 and I think someone close to me is connected to my phone in some way. Is there a way to see if my phone has been compromised, and if so who's behind it and last how can I secure my phone frome being compromised in the future? I have WiFi at my house but at this point I don't trust my fiancé or boss at work. my fiancés mother is an IT Tech and so is my boss. Also I think my next door neighbors could be in on this too. PLEASE HELP it's driving me crazy :crying: iI don't know if there are hidden cameras in my house and they are watching me on a smart tv or if they can go thrugh my phone because of WiFi I just know that something is wrong. I know nothing about cloud or quick connect WiFi connect. I do have a ps4 at my house and every time my fiancé leaves me she takes the tv.... Thank you for any and all advice. Please point me in the right direction

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