Guy's Behavior

My teacher kissed me on the cheek?

He left my school two years ago. I graduted a few months ago. When I had him for a teacher for two consecutive years people woud always tell me that he liked me and I could tell that he was mildly fliriting with me at times during these two years. We text, but not often, and he sent me a friend request on Facebook in September.
I saw him again a week ago after a year and a half of not seeing him in person. He kissed me on the cheek with his full lips on my face, and not like the typical air gretting kiss people get, and hugged me for a long time before he said bye. What does this mean?
He likes you!
It's just a friend thing.
Other: (please explain)
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+1 y
He's 26 years old and I'm 18.
I've known him since I was 15 though!
My teacher kissed me on the cheek?
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