<human>: It really is as simple as that. My girlfriend of 1 year went to a party with her friends for about 4 hours, and i didnt hear from her until the very end. this is especially odd because we text a LOT. I.E. , constantly throughout the day, during just about anything because we rarely get to see eachother irl.

 when she texted me back after the party the VERY first thing she said to me (not hello, not hey, not that was fun) was "haha, we played truth or dare, and i got kissed. its fine tho, hes like a brother basically". this is my first serious relationship, and i will admit im extremely protective, and honestly downright clingy, but as soon as i read that my vision literally blurred, and i was absolutely outraged. i glossed over the kiss completely, and asked her about the party as if nothing was wrong.

now heres where shit gets clingy. i walked calmly down to my garage, and proceeded to punch a solid hole through the drywall....twice. i was honestly furious, and mainly because ive honestly never had to actually deal with any strong emotions before.

 its been about another 3 or so hours since  then, and ive barely gotten a word out of her. i still know next to nothing because i feel like bringing up the truth or dare is just going to make a shitstorm. so far, she has no idea any of this happened

Could you distill the essence of the text into 1-3 sentences?
<bot>: girlfriend soberly kissed somebody in truth or dare, im pissed but she has no idea. am i overreacting/ how do i  proceed?