Is OTHER wrong in the post ? POST : Me and this girl (I’m going to call her Sabrina) have been hanging out about every other day and it’s pretty obvious to both of us at this point we like each other based on what we do and what we say but neither of us has made a move to be more than “friends” yet. 

The guy who introduced me to Sabrina (let’s call him Snoopy) was an old friend of hers, and as time went on I learned she was old friends with really about every one of Snoopy’s friends (which is important later) 

Anyway we went out tonight and had a good time as usual, talking about whatever when the subject of how we met comes up and we start talking about Snoopy and her friend group. I asked her when’s the last time they all hung out and She told me she hasn’t hung out with this guy (let’s call him Richard) in a while and the conversation ends there.

We were at Snoopy’s house where all of his (and her) friends were when it began nearing time to take her home. I left her in a room with Richard (remember him?) to talk to Snoopy and the rest of the lads to decide to take a trip to the supermarket for some snacking before I go

At this point I go back into said room to ask Sabrina if she wants to come with us to the store (it’s pretty clear in hindsight they weren’t sober but he was more drunk than she was), and she says she wants to stay. 

I say okay and we dip, and when we come back I find out they had sex while I was gone. I didn’t say anything and acted like I didn’t know but it was pretty obvious to me what had happened but I shrugged it off and waited in the car to take her home. 

We drive home and she’s really quiet the whole ride so I start suspecting she knows I know. I get to her door and she asks me what’s wrong but I don’t say anything, I mean what would you say? 
 
This is when she starts getting jumpy and desperate with her questions about what’s wrong as she realizes I know. She started to cry and tell me she was sorry and she didn’t mean to do it, that she didn’t mean to throw away her happiness, that she didn’t mean to fuck up so badly but I didn’t say anything in response other than a goodnight 

She is trying to convince me as hard as she can now over text she is sorry, that she regrets it, that she doesn’t want Richard, that she didn’t mean to throw everything away like that, that it was a stupid decision and she wishes she could fix it 

I’m ignoring her texts and apologies because I feel like I can’t forgive someone for doing something like that but then again this has never happened before and I don’t know how to handle it. It’s like a slap in the face to tell someone you want to be with them and then turn around and sleep with someone else after being with them for less than an hour. 

AITA for breaking off this relationship? I don’t know what to do 