Gates took all the credit in the dispatches after Saratoga for himself, never mentioning Arnold’s contribution at all.
Some think that Arnold’s subsequent change into a traitor was caused by this.
I think it was one factor. A big one. He was also severly wounded at Saratoga and that wound took him out of active duty and got him appointed as military governor of PA. That was a mistake...he met and fell in love with a beautiful young tory and got a severe reprimand from Washington for how he conducted his office...even though Washington felt sympathetic to Arnold’s side. Taken all together you can see how Arnold would fall.