<human>: My 20F GF is really attractive and gets lots of male attention. 

The other day her best guy friend (besides myself) kissed her on the cheek in front of me. It really made me uncomfortable and I considered it to be flirtatious. 

She goes over to his house and drinks hard liquor w/ him and his GF. I was ok with this until I learned he had cheated on his GF before. Hard liquor really makes me uncomfortable as its often used to loosen women up. 

Also I am not to sure how to deal with other men complimenting her in front of me. We were at the beach and this guy we had never met walked by and said "nice dress" and checked my GF out. He apologized to me as he walked away.

Can you give me the gist of the text in a nutshell?
<bot>: I am not sure what to do/how to handle it when my attractive GF gets male attention, verbal and or physical.