moving too fast?!??

Coworker and I have been hanging out everyday for 2 weeks. We both really like each other so much, but we agreed that we've been spending so much time together. One day, we went on date at 12pm then we drove to work together at 5pm then 8 hr shift with him, and then we spent the night cuddling. We're scared we might get tired of each other, but it feels so right. I'm NEVER like this at a beginning of something new, so it's extremely weird for me to like someone this much! I feel like we're moving so fast!! HELP SHOULD WE LIMIT OUR TIME TOGETHER?!?!