mom needs relationship help... all advice welcome.. please h

so my mom has been with her boyfriend for over 13 years. he cheated on her in the very beginning and recently started thinking hes doing it again. i dont know how she knows this but she thinks he has a secret email and secret phone. she hasnt seen either so i dont know how true it is. he obviously doesnt want to get married, he has never asked her. they came close to getting married a few times because she basically said marry me or im out... well it never happened and shes still with him. She lives in florida and she isnt very good with phones so i wouldnt be able to explain to her how to put a tracking device on his phone. I keep telling her to leave him, he's been abusive in the past and hes just not good for her. I even asked her today... if you found out he was cheating... would you leave? she said she wasnt sure because of her age and shes used to living a certain life style.. but she needs to know she said. I really dont know how to help from this far away. I have a feeling he has done this on more then one occasion... she leaves him like once every two years... goes to stay with a relative but doesnt find work and goes back to him. I dont know what to tell her. I know as her daughter this really isnt an appropriate subject but everyday shes telling me these things and asking for advice. i mean.. when i lived with an ex that was cheating it was easy to figure out because i could just go thru his stuff when he wasnt around and put tracking stuff on his electronics so nothing would really be deleted... shes not good like that tho. any advice?

I would be so pissed if someone put tracking stuff on anything of mine, not because I'm doing anything wrong but because of lack of trust. Could she just be worried about nothing and be paranoid?

I know a guy that his wife cheats on him all the time. He knows and still will not leave her. I still haven't figured that one out.

Quoting Blythe.:" I would be so pissed if someone put tracking stuff on anything of mine, not because I'm doing anything ... [snip!] ... a guy that his wife cheats on him all the time. He knows and still will not leave her. I still haven't figured that one out."

well i did it to my ex because i was hearing rumors so yes, i didnt trust him. as far as my mom goes she says she needs to know. i would prefer to stay out of it but it is my mom and he has broken her trust numerous times...