Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: This is going to be long and quite compicated, so please bear with me!

My best friend (we'll call him Rick) is also my fuck buddy, or was. We've been sleeping together for a few months and everything has been fine, up until today when he set some new boundaries between us that basically outlawed all forms of affection, from sex to cuddling to kissing to saying "I love you", basically reverting our friendship to strictly platonic. 

Listen, this is totally fine by me. I am capable of accepting boundaries as I want to preserve our friendship. This just came as a blow to me because it was so out of the blue, and the way he delivered it was extremely hurtful. Rick knows I am quite sensitive and he was really rude when explaining why he didn't want to be with me the same way anymore (particularly because I am a naturally affectionate person, the type to say "I love you" to all my friends). He eventually left me sitting on my own and I was bummed out for the rest of the day.

Suddenly out of the blue I got a call from my ex (we'll call him Jay). We ended things in November on good terms, and although we rarely get to see each other and aren't as close (conflicting schedules), we're still good friends and care a lot about each other. Anyway, Jay called and asked if I wanted to hang out, and I said yes.

So after I got home from work Jay came by, and one thing led to another and we had sex. I honestly didn't intend for that to happen, but I was feeling shitty about what happened with Rick and I wanted a distraction. Being with Jay felt like an incredibly natural and comforting release of all that stress and neither of us regretted it in the slightest.

The thing is, I don't know if I should tell Rick what happened. Though we're best friends, our relationship as FWBs was quite casual. He constantly reminded me that I could be with other guys if I chose and that he didn't want to be exclusive in the slightest. Later, however, he backpedaled and admitted that he was very insecure with me seeing other guys, but still gave me permission to do as I pleased. I however made it clear I was perfectly happy only sleeping with him, partly to ease his insecurities. 

I intend on talking to Rick tomorrow to smooth things over since we were both quite emotional today, but I don't know if I should tell him I slept with Jay. I am extremely conflicted especially since Rick has cut all sexual aspects out of our relationship, but I know this would still hurt him, especially since it was literal hours after we spoke. I basically feel like I've cheated on someone I just broke up with, which makes no sense. Am I obligated to come clean? AITA if I don't?

TLDR; Hours after my best friend/fuck buddy called it quits on the sexual aspect of our relationship, I slept with my ex. Should I tell my former fuck buddy even thought it might hurt him?

sleeping with my ex behind my FWB's back