Friends with benefits to lovers? ?

So this guy is my brother's best friend. Since i met him, i found him attractive. After few months, he finally texted me saying that he finds me also very attractive and interesting since the beginning.
He said, he doesn't want to ruin the friendship to my brother, so he thinks friends with benefits would be good for us (but we have to keep it a secret). If we start a relationship , he is afraid of losing his best friend if we broke up.
I'm not sure, because I really like him und would like to have a relationship. What should i do? Can he fall in love with me if we are friends with benefits?

He will fall in love
No, he will not
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Friends with benefits to lovers? ?
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