I’ve never talked to my parter about ballbusting

Not long after getting back from work me and my girlfriend were sitting together on the coach scrolling through her TikToks. She’d washed off her make-up and put on her dressing gown, which hides most of her form. She wasn’t naked underneath but she’d taken off her trousers so when sat with one foot up I could see her bare leg. She wears trousers most days so she has gone a few days without shaving.
I’d retired to just a T-shirt and some boxers.
Suddenly she sat up and pointed to something on the wall. ‘What's that?’
She didn’t say it with fear but more just confusion, like she wasn’t sure what. I couldn’t see anything tho.
‘Where?’
‘Just there’
She raised her hand out again, pointing at what, to me, was a totally nondescript bit of wall, but she still kept her arm pointed straight out at whatever it was.
I slide my butt forward on my seat to get a better look.
Suddenly her arm dropped. Slamming her elbowed hard into my beard unexposed nethers.
I’d widened my legs as to move forward in my seat, giving her a good aim at my unprotected spot. But they closed tightly in again. I folded in on myself down onto the ground.
Her elbow had landed squarely pressed agenst my left testical. I don’t know how hard she hypothetically could, but this was much harder than what I can take. It didn’t hurt much if at all at that moment but I could feel my ball change shape and form when she made contact, and I could feel soft fleshy bit in the inside of my left ball. I assume it stretched inside slight. Pain vibrate from up along my tube up into whatever area is just above my penis, the overwhelming mix of pain and vibration seemed to pull like a liquid pooling at the bottom of my stomach, filling it, and I had to hold onto it with my hands to stop it congealing vomit.
My face curled without my say and tears started forming in my eyes, I looked from the ground up at her.
She had just laid back on the couch with her legs folded underneath her, and went back to scrolling.
I sat alone on the floor for about 10-15 before lifting myself back on the couch. The pain hadn’t passed but I was no longer paralyzed. She turned to me and shared some notable TikTok’s she found when I was on the ground, confirming she wasn’t going to explain and we wouldn’t be talking about how she nearly half neutered me. I give her a lite kiss in case she thought I was angry or annoyed.
I hope she at least found my pain funny, but she never laughed or even said anything after she did this. She’s a very silly and giggly person normally but this was done very stone faced.
This was a week ago and we’ve not said a word about it. I don’t know why she did this.