When my wife and I divorced, I kept custody of our three sons and have raised them. Like you I didn't take money from my ex. At the time she was having a hard time as well. Later when she was doing well I still never asked for help. And, like you, I've had friends and family members tell me to get what I "deserved". The ONLY thing that is important is the well being of your son.
Don't let anyone pressure you into decisions that might not be in HIS best interest. If you need to, talk with your ex and work out something that you both can live with. I'm sure your ex has your sons best interest at heart as well.
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