Dazed, I am sorry to hear that. I think we all had that thought in the back off our mind, as its odd to do the things he was doing, but I guess this confirms it for you. He wants the best off both worlds IMO, being he was lieing to you during the week so he can have his son, though seeing another women on the weekends to satisfy whatever he is lacking inside.

It really has nothing to do with you IMO, it is something in him that has caused this. Yes, PTSD has its behavioural issues to say the least, this being one of them, but only he can find his true emotions and feelings now. What he has done though, is now obviously too late for reconcilliation, as the trust has been lost.

I am glad to hear though that you are taking care of yourself, and your son, and that the house is a bit more stable for you both. That is important, and a very good thing to hear about.