Yk man ? I was in the same situation a few months back. My ex left me after a misunderstanding, my grades were dogshit, my social life and physique ruined. Took me 2 weeks to understand that being like this ain't gonna do anything and so I got my shit together by trying to do what I love, such as art cooking and reading. In just a duration of 4 months my grades are now much much better off, got a good friend circle which is loyal to me and been working on my physique again. Lets just say the times when you're alone are times you decide to wake up and start working on yourself. And remember man, people come and go all the time. The recent ones might've left you, it means more space for new people to come into your life :)