Is OTHER wrong in the post ? POST : Throwaway for obvious reasons. This would belong on r/TIFU as well. Please excuse any mistake I would make, English is not my native language.

I’ve been banging my roommate (let’s call her A), for over a month and a half now. We made it clear since the beginning that we were not a couple and nothing more than sex should be expected.

However, another girl (let’s call her B) has been hitting on me hard in the meantime, and damn, that girl was gorgeous and one of the coolest person I’ve met so far.  Lots of common interest, funny, and also a common desire to keep it simple : no couple, just friendship with... Affinities should we say. Plus, she lives abroad, so serious relationship was out of the question.

B comes to my city this weekend, so it became obvious we would see each other, and most probably end up in my apartment. 

Wanna be a regular honest guy, I told B about A, which she takes better than expected (I honestly thought she would run away). The infamous week end coming up, I decide to also tell A that I would have a date, just so she doesn’t discover it out of the blue.

Ended up pretty bad. She forced herself to not cry in front of me and just left into her room. Now I feel like the biggest pile of shit. Obviously apologized to her latter, but still.

TL;DR : told my one night stand roommate that another girl would come, turns out she had feelings for me all along.