I'm confused

Last night ,(14/march/2014) i went through my standard end of day routine of calling my girlfriend to say goodnight . what i heard in the background of the call was a couple of guys . they joked about being in a relationship with her and i understand it was a joke because i've fooled with other people like that before . only problem was , it was 11:43 pm on a cold night , the room sounded rather silent(unlike the normal sound in her room) and there didn't seem to be any other girls in the room . about 20 minutes later i called again and she couldn't pick . then i called again , she picked and said , she'd call me later . she called about half an hour later asking if i was angry . i said i wasn't but she could hear it in my tone that i was not ok . we have not talked again at length but i feel she was up to something sinister yesterday. i've had a baseless suspicion that she has been cheating for a while now . i really need some help here. was she cheating ? am i over reacting ? how should i go about it ? help please

I think maybe you should just confront her about, in person and see what she says. If you really feel like she isn't being honest with you, then maybe you should let her go.

I agree confront her to her face .... you know her best and see what comes of the discussion. Also you did not mention why you are suspicious of her cheating ? I would evaluate all the evidence you have and present it all to her and see what comes of it. If you still feel lied to and uncertain, it will be a hurdle and an obstacle to moving forward , then take some space or end things.

I've been with her for about two and a half years but I've only been serious about her for about six months.she chased so Hard and showed so much dedication that I just gave in.now,only a week after she met my mom,she's giving me a solid reason to doubt her.

I think you are adjusting to the new girl, that does not have to chase you anymore. You gave in? sounds like a game to me? Do you want to be with her if it took her all this effort to get you to notice her and see she is off value?

It does look fishy. If she was having a party with friends, ideally she should have told you before itself? If they had just landed up, why would they stay back to that hour? Confront her and demand answers.