<human>: So my best friend Ben dated this girl, Rachael for 3 months and then broke up with her because he was juggling a ton of things at the time and didn't feel like he could devote enough time to a relationship.
She was the first girl he really had feelings for and he planned to get back together with her after things died down but it didn't end up happening because she decided that if he had liked her enough he would have made the time to begin with. 

I had always gotten along with Rachael and stayed strictly platonic friends with her after they ended things. Fast forward 9 months after the break up, her and I have become pretty close friends. 
My best friend knows that we're still in contact platonically and he's fine with it. He's seeing someone new and she has had a few short flings since they ended things. 

Last night, we were hanging out watching a movie at my place and sort of half leaning on/cuddling each other (we have done this multiple times and it's fine). Half way through the movie there's a moment where our eyes meet and it just felt right to lean in for a kiss. One thing leads to another and we end up sleeping together. The sex was great but now I can't help but feel guilty about the fact that she's my best friend's ex. 

Neither of us are looking for a relationship (we both have plans to go overseas in the not so far future) but she's a super cool chick (and really attractive) and I think we would make great FWBs.

On the one hand I feel that if we are going to keep sleeping to together I should tell Ben because he is like a brother to me and I don't want to keep anything from him.
On the other hand, I don't know if there is a point in upsetting him/potentially jeopardising our friendship when things between him and Rachael ended so long ago and I'm not planning on pursuing something serious with her anyway. Have I already broken the bro code?

Give me a shortened version of the text
<bot>: Slept with my best friend's ex 9 months after they broke up. Want to keep sleeping with her. Should I tell him? Am I a horrible person?