Why the sudden change in behaviour of my girlfriend?

SmallBoy
I've been dating this girl for around 9 months and we were really good friends for 7 months before that. She always used to be the one calling and initiating contact for about 14 months (everyday even as friends) but suddenly she changed and doesn't message me or call that often. When we are together however she is just as sweet as ever. When I asked her if she loved me she said "Of course." What do you people out there think is the reason?
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Thanks khanmia... Btw it would be cool if I could have more opinions... Thanks in advance!
Why the sudden change in behaviour of my girlfriend?
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