So my girlfriend and I both go to the same school and after class she usually goes home with me but today she said her mom would come pick her up and look for a new phone as her current phone literally doesn't work anymore. 

Here's a bit of background before I go further. My girlfriend and I both met in sophomore year and dated since then. We're now in first year university and til this date, she hasn't cheated on me or at least there is no suspicion for me to believe she has. Until now. I know her Facebook account password and another guy messaged her before asking if she needed help for one of her classes and he could help. She said sure and they met up after school for him to tutor her as she was struggling in that class. She told me about this and I was cool with it because I knew beforehand when they were going to mettup and whatnot so I realized I should trust her more as she didn't lie to me.

But today, she tells me shes going with her mom to look at phones and whatnot. Wrong, I checked her Facebook today and she's going to hangout with the same guy at a local coffee shop to tutor him this time in Calculus; a course he is struggling in. The thing is, I can't call her or text her since her phone is legitimately dead until she gets home where she can message me through Facebook or use her home phone. 

Where do I go on for here? I don't want to tell her I know her password, should I say someone spotted her at the place they went? And even if I do, what's there to say? Or should I act like I don't know and wait to see if he messages her back or something like that?
user
GF went to meetup with a guy she knows she has cheated on me with and is going to hangout with him for a class which she is struggling in. I can't call her because she has her phone dead until she gets home.
assistant
So my girlfriend and I both go to the same school and after class she usually goes home with me but today she said her mom would come pick her up and look for a new phone as her current phone literally doesn't work anymore. 

Here's a bit of background before I go further. My girlfriend and I both met in sophomore year and dated since then. We're now in first year university and til this date, she hasn't cheated on me or at least there is no suspicion for me to believe she has. Until now. I know her Facebook account password and another guy messaged her before asking if she needed help for one of her classes and he could help. She said sure and they met up after school for him to tutor her as she was struggling in that class. She told me about this and I was cool with it because I knew beforehand when they were going to mettup and whatnot so I realized I should trust her more as she didn't lie to me.

But today, she tells me shes going with her mom to look at phones and whatnot. Wrong, I checked her Facebook today and she's going to hangout with the same guy at a local coffee shop to tutor him this time in Calculus; a course he is struggling in. The thing is, I can't call her or text her since her phone is legitimately dead until she gets home where she can message me through Facebook or use her home phone. 

Where do I go on for here? I don't want to tell her I know her password, should I say someone spotted her at the place they went? And even if I do, what's there to say? Or should I act like I don't know and wait to see if he messages her back or something like that?
user
gf went to look at phones, won't allow me to contact her until she gets home, I can't call her or text her till she gets home.
assistant