Why did my friends with benefits blocked me and than come back after few days?

Anonymous
I asked my friends with benefits if he is sleeping elsewhere as well, He avoided the topic , he never chat to me he blocked me on whatsapp. He came back with excuses of his cellphone broke and went for repairs. My point cellphone broken what dat got to do with blocking me, straight away he wants benefits. I felt very upset and disrespected when he blocked me out of the blue because he was my friend. This is the first time I am doing a friends with benefits relationship. Can your'll please advice me what wrong did i do? I asked the questions since its my first time , i dont want to be attached , I have being hurt a lot in the past and i am not ready for a serious relationship.
Why did my friends with benefits blocked me and than come back after few days?
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