My advice is that you must keep in mind that most likely everyone will write to more than one person. You can like someone based on what they have written to you but you need to guard your heart and not develop too strong feelings until you actually meet that person.
Most men will use compliments and expressions of affection as a tools to manipulate women's feelings. I know that women love to hear these sweet things, but like candy most of the time it is just empty calories. I have always refused to play that game because I don't like dishonesty.
But men have to guard themselves as well. I have seen women play those same games.
It is easy to write these words but harder to control one's emotions.
Keep in mind that until you are actually with that person and can hear the voice, look into his eyes, touch his hand and experience the reaction, any feelings you develop are not towards the real person but rather a fantasy created by your mind.
Your fantasy mind be very different from reality.