Time to call an asylum if you ask me.

??

Does he know she stabbed you? If yes and he says that, I think he needs to see a doctor.

Violence should never be a part of a happy relationship

Why would his ex stab his brother?

Violence should never be a part of anything (except maybe self-defense).

Violence should never be part of ANY relationship. Whether it's happy or not.

and she needs to see a therapist.

Depends on whether you count BDSM as violence, but there are plenty of healthy and happy relationships in the BDSM culture, if you do. Regardless, given the way OP phrased it, the type of stabbing going on was definitely not consensual and probably not safe, so unless it was somehow provoked, she needs either legal action against her, or mental help. Possibly both.

Sorry Op. Hopefully they don't leave a scar for you to remember her by :(

#4 stabs wounds ALWAYS show scars -_-

Your brother must be delusional or mentally unbalanced unless you were inflicting severe abuse on your partner there was no reason for her to assault you will a weapon and even so she could have contacted authorities I hope you recover and seek support for your brother

Nothing's pure about someone who does that . Sounds to me like she needs a little help !

She needs a lot more than a little help.

Just a little bit of help

Well that's not the kind of stabbing I would enjoy with my girlfriend

Wow, did you tell anyone about that?

Show him the literal scars, people only care about those

She does sound quite pure. Specifically, pure fucking lunatic.