Why would a women with a boyfriend do something like what happened to me?

[Hailan]

Me (31M) my girlfriend (26F) and our friends were at a trance music festival.
both on different kinds of drugs (me acid and her mdma) we were dancing and the only naked guy on the dance floor was dancing a few like 5 meters in front of us and he gave my girlfirend a bump with he's ass and she laughed and told one of our friends.(i was dancing looking the other way so i didn't see it happen)

some moments later i turn around again and i see him and her under her raincoat and you could see only their feet (later i found he came up to her and asked for a cigarette, she went under her raincoat to light it up to avoid the little rain, and he then went under the raincoat with her.

they were there for at least 2, maybe 3 or 4 minutes its hard to tell. the whole time they stayed covered under there and we could only see their feet. after about a minute i got out of my frozen state (this happening while im on acid was not fun) i went under the raincoat and asked what is going on? i was standing right infront of her but she didn't notice me as she was looking at this guy with a big smile on her face and probably didn't hear me also cuz of the music.

after those first 2-3 minutes they went about 50 meters back to a place of cover, but the whole time they walked there they stayed under the raincoat, this took another minute probably, a friend ran to her when she noticed me.

then my girlfriend ran to me with a scared face and tried to come close to me and i just told her to go away and leave me alone. and we hardly talked for the next day

after a couple days i broke up with her officially. she assured me that nothing happened and that she simply wanted to help this guy light a ciggerete the whole time and that she didn't think of anything else, she didn't even understand he hit on her.

Updates

7 mo

all our friends believe her cuz she is a good sweet girl that likes to help people.
i believe also she didn't do anything under there, but still it didn't make sense why she would stay with him under there for so long as she said that she only tried to light the ciggerete but couldn't give details why it took so long and why they didn't get out of it when they walked 50m back, if she would have said that it was to make me jealous or that she liked being hit on then i would have understood and j

[ta-ra]

She was on mdma. She obviously wasn't thinking clearly, and she probably was just trying to help him. I understand you're mad about it but that drug makes you love everyone and want to be kind. Add in the techno music 5 mins probably felt like 5 seconds to her. I personally think you're over reaching in this situation.

[Hailan]

I understand what your saying, and your probably right that she mainly wanted to help him, and the staying under the raincoat was just a funny part or smth. i dont think anything happened under there.
but you have to understand its a matter of respect, it doesn't change the fact that she has a boyfriend and she shouldn't be in a situation like this, its disrespectful to me and show's she was not thinking of me at the time.
i would certainly wouldn't have put myself in a situation like that with a women, i would immediately think of my girlfriend and get out of there.

I am still friends with her as i know she did not mean to hurt me, tho she wants to get back together i think lately she understood its not going to happen, we just have different morals.

thank you for your opinion, i really appreciate it.

[Anonymous]

I would never waste my time on someone into terrible music and drugs.

[boobliker]

I have that with my SO guys hitting on her and she just does not see or understand, I now just walk over and tell her so she sees what I see

[inhua]

because society is full of simps, betas, white knights and cucks who allow for this bullshit to happen

[Anonymous]

Just goes to show you should do acid out in nature and not in the midst of a throng of annoying people.

[Iron_Man]

don’t use drugs look what kind of trouble you get from it

[katiesmuff]

That must have been one hell of a raincoat!!!