@entspannte ohhhhhhhh feel you (but congrats on (nearly) graduating tho!! you'll rock this last exam for sure!)
In my case, during my Bachelors, I was 24/7 with my friends bc we had every course and lab together but during the masters, everyone did their own thing (= their own specialized topics) and we barely saw each other even though we all started together all those years ago... And some already graduated while others have tons of exams and/or the thesis left. Its just strange how it just... Faded out? Kind of...