<human>: Could you distill the essence of the text into 1-3 sentences?

This has been an ongoing problem and I don't know why it happens, but every time I get very drunk I get irrationally angry at my girlfriend, and noone else. We're both greek and like to party together and have been together for a year and a half, but this is putting a strain on our relationship. I am definitely cutting down on my drinking, but I genuinely just don't understand why I get so upset at her and only her every time it happens. Yesterday I punched a hole in the wall and pushed her onto her bed before leaving (or so I am told), and I am both disgusted with myself and confused because I am generally a pretty easy going person. Help please/
<bot>: Every time I get blacked out I am super happy and nice.. to everyone except my girlfriend (20M/20F)