This morning I (27M) found out my gf (27F) cheated on me, where to go from here?

21,230 points•2,308 comments•submitted by cheatedon4vday to r/relationship_adviceAWALT. Enough saidAWALT. Enough saidAWALT. Enough said5

So our valentine's day plan was to get dinner and spend the night together but I asked my boss if I could come in late as I had some stuff I had to do. However I went to her place this morning to drop off a bouquet of flowers and another gift as a surprise. She gave me a key to her apartment and when I went in there was another guy eating breakfast while she was sitting half naked in a robe drinking tea.

As soon as I walked in she saw me and burst into tears. The guy looked like he wanted to be anywhere but there. I freaked out at first and the guy left. She kept asking what are you doing here, I thought you had to work and saying she was sorry. I tried asking her questions and she wouldn't answer. Eventually she admitted she met him at a bar a couple weeks earlier, they chatted and wound up fooling around in her car and had slept together three times since then.

I took the flowers and the gift and left. I'm sitting at work right now because if I went home my mind would be on her and thinking about whatever they were doing constantly.

We've been together 3 years and were planning on moving in together later this year. I was looking up rings. She said it's because I was her first properly serious relationship and she has no idea why she did something so stupid and selfish. She thought I wouldn't find out and planned to end it eventually as it was just a brief fling. I asked if there were any others but she said no. Idk what to believe at this point.

The kicker is that my birthday was yesterday. We had lunch and got a hotel room together. We had dinner at my place with my folks and I dropped her off at her place around 9.30 as she said she had some stuff to finish doing before valentine's day. I trusted her for fucks sake.

How and why the fuck do people do things like this to others? What am I supposed to do from here?

TL;DR spent valentines day morning learning my girlfriend is a cheater and the details of that cheating, sitting at work staring at my screen

edit at roughly 1:30PM. : I broke up with her, I told her I'll be by later to get my shit and to have it ready. I'll be taking her stuff over and giving her back her key.