<human>: Can you provide a brief overview of the text?

Hi, I've been in a relationship now for about a year and 3 months. It's been without doubt the best time of my life, though of course there have been difficult times. In my mind i've felt that this could be a long, serious relationship.
  We're at university which means there are times when we are with each other 24 hours a day but during semester breaks we have no physical contact. It's difficult because we're a mixture of a long distance and very close distance relationship (we share accommodation). We agreed that we would communicate during the breaks texting regularly , calling each other at least every two days and skyping at least once a week. 
  However, three weeks into the break my girlfriend hasn't phoned or skyped me once. I initiate the majority of communication and when she does text I feel she isn't saying much at all and seems uninterested. Most days she sends less than 5 texts. I've also had an injury during this holiday, I told her and she didn't seem to care.
  I've tried not to talk back to her and ignore her like she has done to me but she doesn't seem to notice. I'm wondering what people think about it and what they should think I should do, if it's me being 'silly' or there is something wrong.
  I also understand she's hardworking and getting ready for exams, i'm revising myself, I just feel we should make time for our relationship too.

p.s. One holiday when we came back to university she had been flirting with someone she had known and was aware he liked her. -Thinking about it she communicated much more with him then than she is with me now. It was also at a time before exams, she didn't have a problem with that then.- When I found out I was physically sick, she thought there was nothing wrong with it. I'm worried that this or worse could happen again.
<bot>: Help on whether my girlfriend is losing interest in our relationship, or if I'm over-thinking what is going on. Advice on where to go from here.