I followed a Google search to this site and instantly felt compelled to tell you what your actions are doing. I am the product of a father who walked out. It is 20 years later and I still can not understand why.
I have no respect for a man who walks out on his family like you have. The same action you have taken has caused me 2 decades of therapy, and many maladjustments that crippled my life. A young boy needs a father in his life, it will scar him to know that he was abandoned.
It seems that Allison is willing to forgive you and have you back, I think it would be wise to take this opportunity, as any success you may have will be empty with out living up to your responsibilities. It’s a Karmic law that you will be denied success under these dubious actions.