I'm thinking of deleting facebook friends out of jealousy.
Why delete your friends?
I am jealous that they get along and have fun.
Reach out to them, I am sure they will have their fun with you. Don't break the connections you have for this reason.
Nah I'm going to delete them one by one and it will feel nice.
It may feel nice in the moment, but it will feel worse later on. Don't distance yourself from your friends, you will feel lonely.