Is it normal to be loyal to a person before a relationship even starts or even if we aren't even dating?

We flirt, I'm into them, but I'm not so sure about them. I'm sure he flirts with other women. We only talk online, never met, he lives far. I'm pretty loyal though as a person. I only chat to him, I'm always talking to him, and available for him, I text him back fast and I stop talking to everyone once we are talking. Is this stupid to do or do you think I should be talking to other people as well? We been talking since December
Is it normal to be loyal to a person before a relationship even starts or even if we aren't even dating?
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