Feelings of sadness

well this is another new day being alone.  I made a decision not to call or text in any way to my stbx.  I feel like I am abandoning her in a way.  but she has chosen this path and left me with no other choice to follow.  So here i go waking up in the middle of the night, lonely and miserable, wanting her but hearing and seeing exactly what they were taunting me about sunday nite.  makes me feel no good.  I know that this is a story that will continue on.  Names will be changing, faces will be different, but the hurting, pain and suffering passes on.  Why?  Why does someone you share life with, love feverishly, desire only them and would do anything for them, why is it that they decide your not worth it and step all over your love?