I’m not for it either. If I met someone and decided to date him, it means I got to know him better and decided I want to pursue a romantic relationship with him.

I think it depends on what “dating” means to you. If you literally mean going on dates, then I don’t see the harm in having lunch with multiple people per week, but once someone expresses serious interest, and begins to become emotionally invested, then I think it’s fair to explain whether or not you’re interested in possibly pursuing a relationship, and explain that thus far you’ve been keeping your options open.
I don’t think that just because someone who’s company you enjoy asks for more time or exclusivity, means you are obligated to give it to them, but if you value the person, then at least you can be honest with them. That will set a foundation of trust for any potential romantic relationship.
Personally, I like to flirt and text multiple guys at a time if possible. It increases the odds that I will have fun places to go and occasions to dress up and wear heels! Lol. My favorite.