How to know if girlfriend is cheating on me

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I have a feeling my girlfriend is cheating on me Please help me 1. She always fights about the past and always fights over a small thing 2. Seems like her parents don't know that she has a phone so she says call only after 12 at night 3. During her exams she studied and said call after 12 and after exams we can Both talk after 10 but its has been almost one month and she always comes up with different excuses like i was talking to my parents or i was watching TV. But her phone is not busy. Can she be using a different phone 4. She feels guilty to have XXX with me and does not want to have XXX anymore. She lost her virginity to me and we did it a lot. But now she says its a sin 5. Long time back Her friend talked to her ex and she got so pissed with her friend and broke her friendship with her friend. When i ask why, she said that it is embarassing. it is like her friends is betraying her friendship. 6. She says she does not want to be with me but cannot leave me. She said that we will meet only once a week( before, we met everyday)