All of this is so new to you and you are very raw. If you take my situation it has been a little over 2 years since I found out about the affair. There are still some sore spots but mostly I have put my life with him on a shelf and I try really hard not to look at it.
I think you should have set times that you have your son with you. they may be a couple of days during the week or every other weekend. Something that keeps you involved on a set and regular schedule. You do need to reconnect with friends, do hobbies that you did before you got married or something you gave up because she didin't like it. Go out to movies or dinner with a friend or group of friends once a week or so.
It seems so simple but does wonders for your spirit. I wouldn't say your wife doesn't think about you. right now she is trying to convince herself that she is doing the right thing...she knows she is not. I think it will make a difference to her when she sees your life starting to come to order.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory