Help me out people >Come home for summer from college >Hanging

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Help me out people
>Come home for summer from college
>Hanging out with old friend group
>Rekindle friendship with 'Z' (pictured)
>Start to discuss interests, hobbies, music, movies, etc
>1 week later
>Hanging out at bar with Z and 2 other friends
>Both of us are extremely drunk and telling each other really personal secrets that the rest of our friend group doesn't know
>Z invites me back to her place to smoke some premium ganja
>We smoke
>'Anon my dealer likes me so please give off a vibe that we' re together or something'
>Night goes on
>End up sleeping in guest room
>Yesterday
>Loaning Z some books to read
>Going to mail them to her
>Anon why don't we go get lunch or get coffee someday before you leave

I have a girlfriend. What do I do. Do I confront my gf about this or just go into it and accept the consequences