<human>: Give me the gist of the text in a nutshell

This has happened in the past. She likes to talk to her exes on the phone/online. I don't think she's ever seen them in person(as they live in another part of the world) but I do know that she likes to talk to them and reminisce. My father was suspicious of her last year and he spoke to me about it . I simply said I have no idea even though I knew about it. I thought of it as an harmless act of two old friends catching up. Does that count as cheating? She's recently become very irratiable and preoccupied. She spends way too much time on her phone. She's also very possessive of her phone, lately. I have very strong feeling that she's for sure talking to someone but I have no idea what to do. Should I let it just pass by like it has in the past or should I confront her?
<bot>: I suspect my stepmother is talking to one of her exes online. Not sure if I should let it die down or if I should confront her.