My friends with benefits has a girlfriend? Is that acceptable?

katze0917
The person just wanted to be friends with benefits. I once told him that I cut off with a man because he lied to me that he was single (he actually has a fiance!). So he assured me that he's currently not in any relationship. He even showed me screencap between him and his "ex" as a proof that he is available now.

One day, he tagged a girl on his post. I went through her profile and discovered she is the "ex" because of matching picture on the screenshot. They also dined together quite often. I asked him why did he told me he broke up. He just said "broke up what" and remained silent.

I really don't get it. I feel like he made a fool of me, or he just don't understand that you cannot have friends with benefits and girlfriend at the same time. Or did I get it wrong? I've asked many friend, both Western and Asian and they said you can date freely if you have friends with benefits, but not when you call someone your gf/bf?
My friends with benefits has a girlfriend? Is that acceptable?
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