What does it mean when a guy gets jealous?

Anonymous
I'm in middle of something with this guy, we made out a few times and we get along pretty well. Yesterday we were a t a party and I was talking with a guy friend who told me next day that while he was talking to me my guy was staring at him all pissed and angry.

Also a guy that likes me was talking to me, and trying to kiss me and getting really close. and I saw my guy totally pissed staring at us, he then came after a few minutes grabbed my face and kissed me in front of the other guy. He then didn't let me go the whole night.

You think he really likes me or he just pissed because he wanted to make out with me ?

What does it mean when a guy gets jealous?
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