My partners friend kissed me.. 😢

So I was on a night out.. and my partner went into town with his other group of friends.. his other group stayed ( some went home early)

But by this stage I got pretty drunk and he offered to take me home, so I agreed I was too drunk to walk home alone, so he got half way somewhere and parked up.. and then tried to kiss me and feel me up, I pushed off thinking “why is my partner being so pushy”to then realise it was his friend.. so we had an argument massively about “why would he do that” .. I haven’t told my partner as I know he has massive anger issues.. and would beat his friend stupid and I would look like the girlfriend who’s just looking “attention” .. I’m so stuck on what to do it’s been 3 weeks now 😢😢😢