I stopped reading after you mentioned that you worked with this person.
Just because you see this person everyday, doesn't mean you should date them.
What if it doesn't work out ? It'll feel awkward, seeing this person all the time and what if it interferes with work ?
It's your life, and you do whatever you want .. and texting is the least of your worries.
Dating shouldn't involve the workplace, and sometimes the space between you both is a good thing, seeing each other once a week at the beginning is better in the long run, as you'll start missing what you have and be glad when the next time comes.
At this stage, your probably seeing this person about 5-6 times a week ... Does that seem normal to you ?