I have experienced the deep deep splittedness that existed in the man I loved.
sometimes it helps me to remember that many things in life are both/and rather than either/or. I say this because you get to remember the love that you and he shared AND be angry with him for stealing. he shared love with you as your son and a human being...AND he stole from you within his addiction. I know that addiction isn't an excuse for bad behavior...but all of us know it is a deep dark sickness.
I am glad that you were able to share love with him, and I am so sorry that he stole from you. It is a splittedness...and both can be true. Don't let the sickness steal everything from your memory of the love you felt.
That being said I am still so sorry for your hurt.