My girlfriend and I have been dating for 10 months. She’s a great girlfriend, everything I could ever want. When we first started dating I saw some guys name in her phone because she had it beside me and she told me “Oh just so you know if you ever see his name come up on my phone don’t worry, he’s my friend I’ve known him since high school and he’s engaged, I just buy pot off him sometimes”. I didn’t think that was a problem because at that time I had no suspicions about her at all. This conversation happened about 8 months ago. However, lately her phone has been going off a lot and she always puts it face down and won’t answer it when I’m there. When she finally goes to check and I ask who that was she says it’s one of her friends. She’ll always say a girl’s name. It doesn’t make sense to me that her friends would call her 7 times in one hour. The other day she was over at my house and her phone kept vibrating on the night stand and she didn’t touch it. When I asked her aren’t you going to get that? she said “No I don’t care who that is, it’s not important”. After it went off again about 10 minutes later, she grabbed it looked at it for literally 5 seconds and angrily turned it off and put it down and said “fucking people”. She then started asking me what were doing next week, as in making plans but I could tell she was agitated. I know she loves me but is she cheating on me?