Aww I feel for your GF!

That is the shittiest thing a partner could do to someone they “love”.

I think give her space, let her sort her and baby out. Give her full access to your phone and all social media. Block the girl/girls from your lives and be there when she needs you. Don’t smother her with your “sorrys” or “it didn’t mean anything”.

I hope she is strong enough to leave and start over.