Awww hun. My parents split up (I was a teenager at the time) and they said they only stayed together until we (me, my brother and sister) were old enough to understand the situation, and so that we wouldnt be affected.
For me, I could tell my parents werent getting along. There was never any arguments, it was all quite amicable, but There was NOTHING there...no passion, no communiation, no happiness. They were both very clearly depressed, and although they both tried to hide it and carry on like a 'typical married couple', I wasnt a stupid child, and I tried to help them through it. Anyway, my mum finally told me her and my dad were splitting up, and that although she loved him, she was no longer In lover him. She was worried about how we'd all react, but in honesty it was a relief.
When they were together, I was blamed a lot for their breakup, and ended up having a lot of their shit taken out on me (never physical but Im sure you can imagine), and my relationship with them was very strained.
They are now with new partners, and are both far more happier apart then together. They are friends with each other, and its much nicer seeing my parents not going through depression, and smiling again. ( My dad even got married this year, and I was soooo made up for him!)
Im a lot closer to them both, especially my dad, as at the time I didnt realise how bad his depression was, until I hit rock bottom.
As for your son...you obviously know what Im going through right now, so I can honestly say, kids arent stupid. They will pick up on how you are feeling, and although at that age they cant voice their feelings, Im sure he will make gestures and react to your emotional state. If youre unhappy, do something about it now...before he gets old enough to understand more.
He wont hate either of you, as long as you are both there for him, and both spend quality time with him. I would say try and stay friends and do stuff with him with your wife, but I KNOW how hard that is!!!!
I honestly do think that its better for a child to have two parents seperate who are happy, then two parents together who arent.
Always here for you if you need to vent....you know I love it!!!