Why is my guy friend suddenly wrestling with me all the time?

The past few weeks he's been more touchy feely, he is constantly poking me, or (playfully) hitting me or like tackling me (but in a way where he is the one who hits the ground, with me on top so I don't get hurt) and wrestling with me. Almost everyday we end up on the ground rolling around wrestling each other, usually with him on top pinning me down and me trying to use my hips to buck him off or flip us over.

Then lately he's started 'biting' me- not hard, just a little bit of pressure. And yesterday he bit me on the neck.

I'm just curious as to why he's acting like this all of a sudden.
Is this normal for close guy and girl friends, once they've reached a certain point in the friendship? Or?

Please! Thank you!
Why is my guy friend suddenly wrestling with me all the time?
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