A guy who we met a few times after I Shaked hands to say bye high fives me?

ok so we met like 4 times and that day I did open up and talked about sensitive stuff I was with my family and he was with his brother and we were at the car and he said bye and left but then I left the car and went out to tell him and his brother bye with a hand shake as usual so he just after I hand Shaked him make a high five and said goodbye so yah I have no idea why

A guy who we met a few times after I Shaked hands to say bye high fives me?
Post Opinion