hi ive been with my girlfriend for a month now and i asked her what she wanted to do this week and she said that she couldnt really see me because she had to study for her exams so i popped round there after id been to the gym just to see how she was, then she gets a phone call from a rob who she said is a friend that she hasnt seen for a long time and his comeing down to stay for a couple of days but she said she had to study and didnt say anything about this rob person to me, now while his down and i ring her of txt her she seems a bit blunt when i talk to her, she says she loves me and every thing but i dont whats going on its doing my head in, what do you think is she cheating on me.