Things with my gf seem pretty normal and we have sex pretty much everytime we meet 2-3 / week...

Tonight she said she had something to take care of and had to go and would be back at 12am, it's now 3am and she didn't answer her phone. She had a similar late night emergency two weeks ago...

I glanced over her phone earlier and saw her texting a guy. Didn't see the text, but saw the name. I've seen the name on her phone before we started dating and the conversation was something beta like (it'd be nice to see you at least a couple times a week, that's not too much to ask) - so I'm thinking its at least an ex...

idk what these late night emergencies are but i'm not ok with it..

1.) What is the line between jealous / possesive and not letting myself get cuckholded / walked all over

2.) Should I put my foot down and demand an explanation and if im not 100% happy with it walk? How do i dl this without looking jealous etc.. Or should i just walk, this girl is really hot & fun and good for my life right now, but not one i want to keep forever...