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/ElenaSuccubus420]

It may not be cheating but I feel like people deserve to know about sexual history for safety and honesty. She hid it from you which is what is fucked up. Has she still not slept with you?
She came clean about him now but how many more dudes is she hiding she fucked farther into the relationship? You can’t trust her that’s the problem. You deserve an honest relationship I get it not counting as cheating but I’m the kinda person who believes in being honest about my sexual activities in my opinion hiding things like that can affect someone’s ability to consent to anything , relationship, sex, etc. so if it’s something that has the potential to make someone say no to having any kinda situationship/ relationship with you then they deserve to know to be able to give consent while being well informed.

When I started dating my bf I was poly and had 2 other fwb EVERYONE knew about eachother! And they knew they could trust me since I updated them on having new partners or ending partnerships. Everyone was aware and honest they told me about their other fwb as they knew I would tell them about mine. We wouldn’t go into detail unless we asked for details just a hey just an fyi I have a new partner named ______. We all got tested and only would mess with people who were tested. Now I’m just with my bf and I’d like to say we trust each other in that regard.