Blocking a Snapchat friend

Good evening, I have a big problem:

I accidentally blocked a friend of mine on Snapchat and I unblocked him right away, but I realized that I need to send him a friend request again because he has been removed from my friends list and I don't understand why since I only blocked him. If blocking equals deleting, then why are there two options?

So I wanted to know if there is a solution to get him back in my friends without having to send him another invitation.