Why has he opened up to me?

Warning: this is long. Please do what you can to help anyway! xxx :o)

He:

-CONSTANTLY accuses me of liking other guys, even if I'm just talking to them

-has asked me who I liked two times

-looks at me A LOT and for LONG periods of time. I mean A LOT

-debates with me a LOT

-asked if a guy who liked me had a chance

-said a guy who liked me "pissed him off a lot" but then quickly said "but he's a good guy"

-repeats the name of my lip balm when I'm putting it on then smiles

-confronted a guy who called me an ugly slut

-is always the one who starts the highfives between us

-seems to look at me a LOT when I'm with other guys. I mean every time.

-checks only me out when I'm with a bunch of skinnier and prettier girls. In fact he checks me out a looot

-said my stockings looked "half like they were stockings and half non-existent" at a party when he was clearly checking out my legs. Which brings me to the next point..

-looks at my legs, face and boobs A LOT

-steps on me/bumps into me (literally) often

-will stand RIGHT BEHIND ME, when he comes to talk to me and my friends. I don't just mean behind me, I mean almost touching. It's smothering

-laughs at and re-uses my sayings

So you might be thinking "oh he definitely likes her" or "he's just trying to be nice" but in the past couple of days he's actually acted a little more open to me...

- he accused me of being romantically involved with two of my guy friends. He said to my guy friend "you hang out ALL the time, you flirt with her and you just touched her back".

- he's been asking me a lot of questions

- playfully calling me names

- said "my maths class is meant to be like really advanced. They're meant to be even better than your class" in a cheeky voice

-wouldn't stop looking and smiling today when we were talking. Like he didn't stop eye contact the whole time

Why has he opened up to me? Thanks in advance! :o)