I have a friend who also claims he met an angel in a park, just like your experience. He was with his wife and they would argue often. Out of nowhere this soft spoken guy came up to them. He knew many languages, and offered some advice after they chatted. Left the same way he came, they looked in the direction he went after a minute and no one was there. They could see for a long way down so even if he was sprinting he could not disappear. I believe both of you, I've had too many supernatural experiences myself.