Random people think we are either dating or family from first glance? Why?

[female13]

So my friend and I like to bicker and tease each other often, at the same time he seems to get annoyed with me easily and can become distant. When we are out we get asked by random people if we are dating, to which we both put a lot of emphasis on it and are like Nooo!, or we also get asked if we are siblings sometimes too which we reply no that would be weird, as we have slept together once over a year ago, (he didn’t want to do it again and I had feelings for him which he did not return, but remained friends) but he feels the need to explain why it would be weird especially if it’s with a guy I’ve been flirting with asking…

last night we were out and someone asked him and our friend if they were together, which they both replied calmly ‘no, just friends’. Why does he have to be dramatic with me when asked that question? But calmer with her?

[spartan55]

You aren't fooling anyone. You don't fuck your friends.