My twin brother's best friend saw me naked?

Frigg_xoxo
I was deciding which clothes to wear, whilst doing so I was naked, for a formal party which was being held by , obviously, relatives; but before I was able to put any clothes on my twin brother' best friend walked in on me naked. I was too shocked to do anything so I just stood there but he walked towards me, with his hand outstretched but then stopped, realising what he was doing and quickly walked out.
Since then he doesn't come near me or acknowledge me in anyway when my brother is near, however when he isn't near he acts in a chivalrous manner towards me and smiles but doesn't say anything.
What could this mean?
P. S it only happened a week ago.
My twin brother's best friend saw me naked?
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