Heartache,confused,lost.

Hello, so i recently found a new job and there is this guy that since the moment i saw him i don't know why but i felt something strange, chemistry,tension & like if i knew him but truth is i have never seen him just until i started this job.. I can't stop thinking about him now  it's like if we were connected in someway the worst of my case is that i have a boyfriend i have been with him for 3 years and i have never felt this with someone else i am a person that believes cheating is not good but my relationship with my bf at first it wasn't easy he didnt appreciate me at first but now he has changed.. But now the guy at work i feel like if i were in a movie,he gets nervous around me,the way he looks at me,the short but tense conversations, & many things i can't explain... I believe in the soulmate things but i don't know if this is it.. Also i had a Deja Vu with him. I think he feels the same i feel but i am not sure. I get nervous around him and so does he because i notice. What is this? i have never felt something like this not even in college,HS, or other work place. What should i do? Has anyone felt this way?