I have a crush on my best friend
Have you told your best friend about your crush on them?
Yes, I think he/she has some feelings for me as well.
If you're spending huge amounts of time with anyone, their familiarity will start to feel comfortable. Communicate your feelings and let them know what's going on so that it doesn't get weird.
You're right. I see him or her everyday so we have to hang out and talk.
That is good that you see each other everyday and are able to finally communicate how you feel.