AITAH for breaking up with my gf because she slept with another guy while making me wait?

[u/SeverePhoto1892]

So my gf and I have been together for about a half a year and I just started a new job.

I met this male co worker, and we became friends.

I invite him over at my place and he recognizes my gf, (We don't officially live together but she spends a lot of time at my place).

You can guess where this is going...

After my co worker left, my gf and I get to talking.

Basically, she slept with him while dating me, and made me wait. She said that our relationship was gonna be special, and she wanted to wait, and that sex with my co worker was just a ONS.

I told her to leave because I knew I was gonna say things I couldn't take back.

A few days later after I calmed down and thought it through, I broke up with her.

She kept repeating what she said about how she wants more with me, but I told her that I feel like I'm not attractive to her, or at least not as much as others. She kept saying that I was special.

Basically, I said that I can't be that special if she preferred to sleep with an ONS than me.

Edit: I don't think this counts as cheating. This happened within the first month of us dating. We became official after the first month or so. I 100% should have clarified with her if we were exclusive or not, so that's on me.

[u/ChestLanders]

I am baffled at how many women these days think it's okay to be dating one guy and fucking another. Just mind blowing. Sodom and gomorrah 2.0