Are guys more honest when they are drunk?

Ive been dating this guy since December and he's very unemotional/stoic. BUT when he's drunk he practically can't stop staring at me. At first I was like what the hell but then he would stare at me and start gushing. Telling me how pretty I am etc. However its only when he's been drinking...when he's sober I will ask him like hey do you remember when you were drunk last night and called me pretty? hell just look at me and say yes and its true. Why can't guys just say stuff when they are sober lol
Are guys more honest when they are drunk?
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