Because we are made to cope with our surrounding, to defend us, to protect ourselves. We act according to our circumstances.
We are made to give the best of ourselves but we have our background, our past experiences, our own issues.

If I go away from you, perhaps it's not bc you don't like me, on the contrary perháps is bc I'm an avoidant and I don't feel that I decerve your company. Sad but it's true.