As you can see, things is not going to be the same
anymore.
like shaunlaw say, you step over the line.
what done cannot be undone.
let me tell you the things that can be done and waht is the likely
consequences.
1)you leave things as it is, things will eventually die down. you
will lose her as a friend, unless you befriend her after that. you
still have some projects together with her, things will be
awkard.
2)you write a letter, asking to be forgiven and promise you will
not do such things again. things may go back to normal, but not
gurantee.. depend on the girl character.
3)or third, ask the other friend to help, the one that you wrote in
the first place. higher chance, tell her what you think, and what
you afraid of and please tell her that you still have project
together, thing will be awkard ans so on. high chance she help,
girls softhearted and give her a treat after that.