Is AUTHOR wrong in the post ? POST : I found this out a week ago

Best friend= bf.  ex boyfriend= eb me= e

A little back story, i had recently started talking and spending time with eb and things were going great until he handed me a house key out of nowhere so I would be able to get into his apartment when I pleaded. That was after a week of me coming back into his life after 3 years.

I had introduced my bf to eb after awhile and we all hung out and it was nice, they hit it off perfectly fine. 

I ghosted eb not to long after that and just cut off all contact, I got scared away by how fast everything was going.

Now eb and bf are in a relationship, and i cut bf off, Am i the asshole?

Might have some grammar mistakes and i’m on mobile.