Is my boyfriends brother flirting with me?

Anonymous
My boyfriend of 5 months introduced me to his brother a couple of week ago, he has just came out a relationship of 17 years! everytime my boyfriend goes to work he changes towards me, he touches me playfully like slaps my arm etc and is so much more nicer to me when my boyfriend isn't there! He could just be being nice but I just have a feeling! Can someone help as it is my boyfriends older brother
Is my boyfriends brother flirting with me?
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