I'm definitely not in the position to give professional advice, but as a man, I understand his need to be close more and more. That is how we, as men feel a connection.
In my case, the wife and I did alot together, but she also does alot of volunteer work thru non-profit organizations and thru church ministries. Hence she developed friendships with people that I did not know. This has been going on for several years. I also do alot with men's groups and have a separate set of friends, but in our large circle everyone knows everyone.
Over the last year, she developed an insatiable desire to get fit...eating right, exercising, dressing more provocatively (noticed more by friends than me). All of those things got her in the best shape of her life and attracted me to her even more, which in some of her reasoning, was a cause of her pulling away from me. We are such odd creatures.
Several months before the BD she started an EA with a very new family friend. This was obviously denied by her, but phone records don't lie. About 3-4 months into the EA I got the dreaded ILYBINILWY conversation. Over the next few months the conversation changed to the total MLC script and then she moved out and filed in Nov. I has been a fast 6 months.
I guess when they say GAL to me, I feel it is something to get myself away from my situation for a while...exercise, hobbies, music, hiking, reading, etc. And thru all of those new things you'd meet people that have like minded thinking.
I guess in your case you say you had a life that he wasn't a part of or didn't want to be a part of? Did he ever express a desire to do other things with you away from the kids/house, or things with your work friends?
Me 49 W46 T25 M22 S22 D18 S13 W had EA Apr-Jul 2016 Dropped Bomb 7/9/16 ILYBINILWYA HER DIVORCE IS FINAL...8/18/17 Dropping the rope to SURVIVE & THRIVE!!!