How rare is it to feel physically attracted to someone and they are attracted to you as well?

So here's the deal I met a guy three years ago and I felt instant attraction towards him and I knew from friends that he feel exactly the same, so I distanced myself from his circle because I was with my 5 years boyfriend, later on I broke up with my boyfriend for different reasons, and reconnected with the guy with electric attraction, we became close and feelings developed, one thing led to another we were cuddling for hours, kissing, making out, we were insatiable we could stay away from each, we cannot actually be together for some reasons, but I cannot feel the same way towards anyone else or accept the physical touch from someone else, what's your opinion on that? How rare is it?

How rare is it to feel physically attracted to someone and they are attracted to you as well?
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