Why has my girlfriend stopped texting me?

So here's the deal. My girlfriend and I are together for 3 years now. We recently moved in together and so far all has been going great.

She is currently travelling for work and while we talked the first couple of days her behaviour has become very unusual. She pretty much leaves me on read whenever I text her and sometimes it takes her hours to read the messages even though I can see she is online.

I have very bad anxiety and she knows this too, but I am beginning to think the worst here. Last night she went on the blink when we were meant to chat and I didn't even get an explanation this morning. I sent her a goodnight text and once again I was left on read? Is this the end?

Why has my girlfriend stopped texting me?
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