Is it normal to lose feelings for your girlfriend?

My girlfriend just started her internship and cut communication with me for 3 days.

I couldn’t sleep properly at the start and was left wondering what had happened for her to respond like this.
But as I got more hurt my feelings for her began to cut off and I’m ready to let her go from the hurt I’ve experienced in 3 days.
Is it normal to lose feelings for your girlfriend?
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