Guys: He kissed another girl in front of me! What does that mean?

ak1995
I've been seeing this guy for more than one year now, that I really like. From time to time I even sleep at his place (in his bed) after a long night... we don't have sex but we do have "fun" sometimes (I usually keep teasing him)... one night he told me that he really liked me (but he was drunk) ... so that other night, a girl from berlin visited him and him, her and me ended up at 4 am in this bar and as the girl went to the toilette we started kissing (like we often do) then I went to the toilette and as I come back I see them kissing too... he noticed me and said sorry but I was so pissed and he introduced me to a friend of him and as I say "hi" to that friend, "my" guy and this girl start kissing again in frot of me... I left the bar right away... although I want to forget him, I can't get him out of my head

so my question is ... what does kissing mean to guys? or why do guys do that?
Guys: He kissed another girl in front of me! What does that mean?
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