A few weeks ago I was hanging out with a girl that I've known for like 5 months. At around 2am her phone randomly vibrated, this never happens.

I asked her who texted her at this time, she said "it's nobody".

I drop it because I don't want to act jealous, I don't ask further, however if I inquired further it's likely she would tell me.

Obviously I smell bullshit. so when leaves for a second and I activated the front screen, see it's a guy, his reply was about some test and how he did bad on it, very innocuous. I can tell he's probably a beta orbiter or he's her plan b incase I go.

I recognize his name. A month back I saw her and him walking to a class a few months ago in school. Back then I asked who she was walking with, she told me his full name. She told me he's a guy that has been talking to her in school for a few months and he had asked her to come with him to some event, I told her not to go and she told me she agreed. This is the type of girl that has a lot of male friends/is tomboyish. I'm pretty sure he's friendzoned and not fucking her as I leave tons of marks on her, however, I got really jealous at the time and lost my frame and she promised me nothing would go on.

A few weeks pass after the "nobody" incident, and her phone vibrates again. I ask her who it is and she says nobody. I never get to see her phone. I tell her not to bullshit me(it's possible it was just an app putting out an update). She says she promises she's not. We sort of get into a little petty fight and she tries shit testing me by acting mad. I ignore her. Eventually we laugh it off.

Chronology is: a few months ago I see them walking, a few weeks after that I see the text from him, and a few weeks after that her phone viberates at night but I never get to see who it is.

Anyway my question is, how best should I handle this situation? I'm 99% they're not fucking, however, how do you handle another man/beta oribter talking to your girl?

A lot of you will say, "next, spin more plates, don't act jealous" however I feel not standing up for what you want and pretending not to care seems a little...spineless. I expect my women to tell me what's up.