Quoting Miss Brittany:" That is the problem. He whines and moans that I never let him see our son. He is welcome to see him anytime ... [snip!] ... to contact his son and be a part of his life, then I would consider this. He has not called in almost 2 months to talk to him. "
You're a parent every day, things like that comes naturally to you. For someone who doesn't get to see their child as much as they want, they're not going to have all of these great parenting ideas., and frankly, judging by how unwilling you seem to be to help him see his son, I doubt he feels like calling you to talk to him would end well. On top of the fact that phone conversations with 4 yr olds aren't exactly easy. You assume that he is not struggling as much as you are and that it's easy for him to travel all the way to you.
You two both need to be making a 50% effort and stop playing the blame game. It's not about either of you, it's about your son.