Why is my girlfriend acting distant lately?

Anonymous
So I have been seeing a girl for over a year now and so far everything has been great. We live in different cities but get to see one another a few times a month. We are very much in love and get on very well together.

However lately I have noticed she is not the same. We used to talk throughout the day and she would be bowing up my phone with texts, snaps etc. The last few nights she doesn't even want to video chat, which we usually do, and when we have talked it is very brief and she sounds bored. Then she says she is going to bed but I see that she is online late into the night.

Like I said when we are together we get on extremely well but this behaviour is concerning me. Is this a phase or should I be worried?
Why is my girlfriend acting distant lately?
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