Should I ask out my bestfriend?

We have been best friends for a little more than 8 years. I'm not sure if she likes me but recently she has been txting me alot and we went to disneyland, just me and her. We were also going to go to the movies but she got sick( we were going to see gnomioand Juliet) We also spent the superbowl together. I don't want to ruin our friendship though. I'm not sure what to do but I do know that I have liked her. I am a guy.