*is this the punishment i am getting from Allah for leaving my husband??that i am regretful??will i keep regretting all my life?? can i ever settle down again or not?can life ever be as happy as it used to be b4?how long will my punishment last?is this all i deserve?? *
It's not a punishment. You need to change the ways of life.
At this point you do not have anyone special in your life and it's making you feel lonely. When you are lonely you would RATHER be with a companion who's attitude you could have "ignored".
So STOP being in the "lonely" atmosphere. Find a companion soon. Good luck.