When did you realise that the one friend you actually had didn't

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When did you realise that the one friend you actually had didn't want to have any contact with you anymore?
Stopped talking to a friend for about 2 weeks cause both of us are studying and exams are coming up.
Try messaging him saying hey bro what's up let's hangout some time..responds like 5 hours later(usually he responds like 5 mins later). "Sorry already got plans". Doesn't even text something like hey let's do something another time. I feel dead inside knowing that the one friend I had had apparently forgotten about me because we didn't talk for 2 weeks.. i felt like we were strangers when we texted each other