I believe that my past makes me who I am today.
I believe my past had made me who I am today.When he left my mother, siblings and I it was a truly devastating time in my life.
When he left me, my mother and siblings, I felt devastated.Itthere were times whenthat I went to sleep at night and prayed that we will still have a roof over our heads the next day.
... strong sentence
For months and months and still to this day, I wondered how can my father do this to his family, the same person who told us everyday that he loved us and to trust him that he would never do anything to hurt us.
This one sounds slightly repetitive of your idea... Let's try some other way;
For a long time, and even still, I have been struggling to comprehend the reasons why he, the same person who showed so much love towards us, cheated us left so painful memories in our hearts.