Confronting ex best friend and coronavirus

I honestly have no idea, but i am sure that it was less. He used to reply instantly to texts when we first became friends and did that for a few years. Then it slowly got longer and harder to get in contact or see him unless I waited by his class. He is the only real friend that I have ever had of someone who is my age. I know that I was desperate to see him, but I really tried to control showing my obsessive impulses. The obsession grew with time and I was a lot less obsessed when we first started hanging out than I am now. I'm not sure why the obsession happened. One of my previous therapists from years ago predicted that this would happen with my first friend.