When we meet someone for the first time especially the opposite sex, our first instinct is always to impress.
To impress with the clothes we put on, the words we say, the way we act, how we eat...we just want to make him/her feel like we're somebody but in the process of doing that we actually fail to become real.
When texting someone, we like to try as much as possible to watch what we type. We want them to like us so we don't act normal. We try not to say things that may hurt them but we forget that a time will come when we can no longer fake it. We forget that being real and being yourself is something you should never change for anyone.
If they don't love you the way you are then that's a sign that you should move on.