Valentin and the further course of action

I was wondering, how i should behave with Valentin now. And i have two options.
One is to be cold, let him know that i am not interested in having any sort of relation with him. And then that will progress to us being acquaintances, most probably, like Savannah and Troy. I don't want that. I don't want that situation because it means losing a person from your life. I would rather have a formal friend or friendly colleague.
That leaves me option two. Just be like i am any other guy. Formal talk. Smile.