Whoa, it's like the fuckin' love connection.
Open relationships are bullshit and just an excuse for people to slut around and still have someone to come home to with milk and cookies waiting.

The blood was probably from your nails scratching the inside of her vag.
Cut them.
Promptly.

When my ex lover and I had acrylic nails (you know, those pretty ones) and I'd finger her she'd always bleed, same with me..it's not like a "WHOAMGZZZZZZZ" thing, it's a "oops, vaginas are delicate" thing. It never really hurt either of us so we didn't know until we looked down lol.