Focus on the positives and refuse to dwell on the negatives, as negatives always drag you down, but happiness is truly a choice.
With your son, you are in it for the long haul.
Seek open and trusting communication with him.
Don't discuss the negatives of your relationship with his mother *This is important*
Refuse to get into battles with her. It is better to quietly acquiesce after stating your opinion. This is karma and it will come around.
Make sure your times with your son are enjoyable. It doesn't have to be thrilling Six Flags fun, but it does need to feel connected.
If he feels that you truly care for him, your relationship with him will be the best it can be.
This doesn't mean that you are the candy man, but that you really seek what is best for him.
Don't grow weary in this--Again, you are in it for the long haul.
Didn't mean to inundate you with advice. :blushed:Being a dad is the highest calling a man can have. I feel very strongly about a dad's role and his relationships with his children.
HTH