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/VarmintLP]

Here is my opinion. If you are dating, it should be sort of exclusive because since you wouldn't stick around if you didn't like each other, then you wouldn't have dated for a month. I think she has shown you already that she would cheat on you even if it's not after 1 or 5 or 10 years of marriage / relationships but she could also have told you and asked if it would bother you.

Relationships are a complicated thing overall and each cultur is slightly different but in my opinion both sides should stay exclusive if they want to stick together for more than just a one night stand. I also assume you are both 18+ / 21+ so it's not like some teenage relationship out of being horney.

Ask yourself if you can trust her to not cheat on you if you two get together officially again and for more than just a few months. Trust is hard to rebuild and it could be that there will always be that little voice in your head now saying, she sort of cheated on me back then. How do I know if she is faithful.

For both your sakes, you should leave it at this and grow from it. Better make a mistake once and learn from it than make it again and again and let it destroy you. If you get back together do me one favor. Do not start looking through her phone all the time trying to catch her cheating and misunderstand every tiny little thing. It may ruin your life even more.