My girlfriend forgave me but said she needs time to heal?

So my girlfriend and I were supposed to attend to a party together, but she eventually called me and said she would come late due to work, and said that I can came earlier.

So I came alone, and waited for her. But she took so long and I started to get drunk. Then I was completely drunk and this other girl got me into a room (I don't even remember how that happen). And I don't know what did she do to me. I only remember that she was on top of me as my girlfriend opened the door and caught us. Then she ran away crying... Then I tried to follow her but I passed out.

I begged her to forgive me, and she did, but she said she needs time to heal and prefer not to talk to me during that time. I've waited 5 days without talking to her. I only text her a bit but she keeps saying she needs time. 5 days seem like 5 centuries to me. I don't understand. She needs time to what? Why is she taking so long? How long does this kind of thing usually last? I love her to death and I swear I'll never get that drunk again.

Usually when a person said they need time, what are they usually doing? I know I'm completely the wrong one and it's all my fault, but I just don't understand what is she doing that she doesn't want to talk to me and said she needs time?
My girlfriend forgave me but said she needs time to heal?
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