Most Helpful Girl
It depends. I don't see anything wrong with talking to other guys so long as they are legitimately just friends and you're not hiding anything from your significant other. The fact that she was lying about it and not respecting the way you feel says a lot. That isn't a good relationship and you did the right thing.
Most Helpful Guy
It depends on a lot of things.
There is nothing wrong with texting guys, as long as they are decent and actual friends, NOT random strangers that hit on all girls (including her).
Two hour long conversation? As long as its not every day, its fine. It depends.
She seems REALLY immature.
You asked her to stop and she didn't gave a shit. She lies to you. And she says she doesn't love you...
You did the right thing.