Okay, I know this isn't timely but I hope this reaches you.

I completely understand your point of view unlike all the insensitive people with a lack of empathy that have commented here. And no it wasn't your fault.

No a very drunk friend inviting you to sleep in her bed isnt an invitation for sex. As someone with a lot of female friends and as someone who protects his female friends from creeps when they get drunk, I can say that it was completely his fault and he took advantage of you.

People who think guys and girls cant be friends are misogynists.

Considering its been another 3 years since the incident, I hope you've gotten stronger and have learnt to treat creeps like him like the they are.