I am not a psychologist, but according to what you have written I would say your feelings about his time on the net are true. Unfortunately, some people do get addicted to the Internet. The simple reason I believe is that you can be anyone or anything you want on the Internet.
You can paint yourself to fit any one's dream person. There is a country song that describes this so well. Here it is:
I work down at the Pizza Pit
And I drive an old Hyundai
I still live with my mom and dad
I’m 5 foot 3 and overweight
I’m a scifi fanatic
A mild asthmatic
And I’ve never been to second base
But there’s whole ‘nother me
That you need to see
Go checkout MySpace
‘Cause online I’m out in Hollywood
I’m 6 foot 5 and I look damn good
I drive a Maserati
I’m a black-belt in karate
And I love a good glass of wine
It turns girls on that I’m mysterious
I tell them I don’t want nothing serious
‘Cause even on a slow day
I could have a three way
Chat with two women at one time
I’m so much cooler online
So much cooler online
When I get home I kiss my mom
And she fixes me a snack
And I head down to my basement bedroom
And fire up my Mac
In real life the only time I’ve ever even been to L.A
Is when I got the chance with the marching band
To play tuba in the Rose Parade
Online I live in Malibu
I pose for Calvin Klein, I’ve been in GQ
I’m single and I’m rich
And I’ve got a set of six pack abs that would blow your mind
It turns girls on that I’m mysterious
I tell them I don’t want nothing serious
‘Cause even on a slow day
I could have a three way
Chat with two women at one time
I’m so much cooler online
So much cooler online
When you got my kind of stats
It’s hard to get a date
Let alone a real girlfriend
But I grow another foot and I lose a bunch of weight
Every time I login
Online
I’m out in Hollywood
I’m 6 foot 5 and I look damn good
Even on a slow day
I could have a three way
Chat with two women at one time
I’m so much cooler online
Yeah, I’m cooler online
I’m so much cooler online
Yeah, I’m cooler online
Yeah, I’m cooler online
Yeah, I’ll see ya online
ONLINE LYRICS – BRAD PAISLEY Song Words
I do not know your husband like you do, is he some how portraying himself to be more than he is to people he does not know because of insecurity?
Look at your marriage, if you are not saying we, instead of you or I then the marriage has not developed to the "one" state.
Sometimes we make the wrong choices in life and we perceive a person we think we are in love with according to that perception. You need to sit down together and talk about all the things you loved about that person originally, and maybe figure out together how you lost it.
If it is truly lost or never was, then it is time to face the need to separate. A child living in a house without love according to statistics is more damaged than a child without parents together. You are giving the child, the wrong perception of how a marriage should be.
I wish you happiness in the decision you both make. Turn to the Lord he knows more than I do. God bless you with his knowledge.